Dept of Physics

THE UNIVERSITY OF HONG KONG
Research and Scholarship 2004

DEPARTMENT OF PHYSICS

Researcher : Beling CD

Project Title:	Centre for optical and positron characterization of defects
Investigator(s):	Dr. Beling C.D., Prof. Fung S.H.Y., Dr. Ling F.C.C.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Central Allocation Vote
Start Date:	03/2001

Abstract:

To provide the University of Hong Kong with a well-equipped center for studying point defects in semiconductor and other industrially related materials - a center that's expertise and equipment would also be made available to other universities in Hong Kong according to need.

Project Title:	Centre for optical and positron characterization of defects
Investigator(s):	Dr. Beling C.D., Prof. Fung S.H.Y., Dr. Ling F.C.C.
Department:	Physics
Source(s) of Funding:	VC's Sub-Committee on Equipment
Start Date:	03/2001

Abstract:

Project Title:	Developing VE-PALS (variable energy positron annihilation lifetime spectroscopy)
Investigator(s):	Dr. Beling C.D.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	10/2002

Abstract:

To set up a means of taking PALS spectra on solid-state samples using the HKU magnetically guided positron beam.

Project Title:	Studies on positron field assisted moderation
Investigator(s):	Dr. Beling C.D., Dr. Ling F.C.C.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2003

Abstract:

To make some positive step towards achieving a successful Positron Field Assisted Moderator (PFAM) by carrying out studies on clean initmate metal-semiconductor junctions; to conduct PFAM investigations only on the following semiconductor substrates: GaAs, GaN and Sic possibly using semi-insulating forms of material; to use the most advanced diagnostic positron spectroscopy techniques, including Coincidence Doppler Broadening Spectroscopy (CDBS) to study any adverse positron trapping at the metal-semiconductor interface.

Project Title:	Studies on positron field assisted moderation
Investigator(s):	Dr. Beling C.D., Dr. Ling F.C.C.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	09/2003

Abstract:

List of Research Outputs

Chen X., Ling F.C.C., Fung S.H.Y., Beling C.D., Wu H.S., Brauer G., Anwand W. and Skorupa W., Deep level defects in He-implanted n-6H-SiC studied by deep level transient spectroscopy, Materials Research Society Symposium Proceedings. Materials Research Society, 2004, 815: J5.5.1- J5.5.6.

Chen X., Fung S.H.Y., Ling F.C.C., Beling C.D. and Gong M., Deep level transient spectroscopic study of neutron-irradiated n-type 6H-SiC, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 3004-3010.

Chen X., Gong M., Fung S.H.Y., Beling C.D. and Ling F.C.C., Deep level transient spectroscopy study of particle irradiation induced defects in n-6H-SiC, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 534.

Chen X., Yang C.L., Gong M., Ge W.K., Fung S.H.Y., Beling C.D., Wang J.N., Lui P.M.K. and Ling F.C.C., Low energy electron irradiation induced deep level defects in 6H–SiC: The implication for the microstructure of the deep levels E₁/E₂, Physical Review Letters. New York, The American Physical Society, 2004, 92: 125504:1-4.

Cheung C.K., Kwan R.P.Y., Shan Y.Y., Naik P.S., Weng H., Beling C.D. and Fung S.H.Y., Millimeter positron focusing using a hybrid lens design, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 465-467.

Ho K.F., Beling C.D., Fung S.H.Y., Cheng V.K.W., Ng K.P. and Yip A.M., Deconvolution of positron annihilation coincidence Doppler broadening spectra using an iterative projected Newton method with non-negativity constraints, Review of Scientific Instruments. New York, American Institute of Physics, 2003, 74: 4779-4787.

Ho K.F., Ching A.H.M., Cheng V.K.W., Beling C.D., Fung S.H.Y. and Ng K.P., Optimized coincidence Doppler broadening spectroscopy using deconvolution algorithms, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 477-479.

Ho K.F., Beling C.D., Fung S.H.Y., Biasini M., Ferro G. and Gong M., Positron-electron autocorrelation function study of E-center in Phosphorus-doped Silicon, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 111-113.

Ho K.F., Ching A.H.M., Beling C.D., Fung S.H.Y., Ng K.P., Biasini M., Ferro G. and Gong M., Positron-electron autocorrelation function study of E-center in silicon, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 5549-5555.

Huang Y., Chen X., Fung S.H.Y., Beling C.D. and Ling F.C.C., Experimental study and modeling of the influence of screw dislocations on the performance of Au/n-GaN Schottky diodes, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 5771-5775.

Huang Y., Chen X., Beling C.D., Fung S.H.Y. and Ling F.C.C., Spatial distribution of carrier concentration in un-doped GaN film grown on sapphire, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 534.

Lam C.H., Ling F.C.C., Beling C.D., Fung S.H.Y., Weng H.M. and Hang D.S., Vacancies in electron irradiated 6H silicon carbide studied by positron annihilation spectroscopy, Mat. Res. Soc. Symp. Proc. Materials Research Society, 2004, 792: R3.19.1-6.

Ling F.C.C., Chen X., Gong M., Weng H.M., Hang D.S., Beling C.D., Fung S.H.Y., Lam T.W. and Lam C.H., Identities of the deep level defects E₁/E₂ in 6H silicon carbide, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 135-137.

Luo Y.L., Fung S.H.Y., Beling C.D., Ling F.C.C. and Li S., A search for defect configurational changes in the post-breakdown metastability of semi-insulating GaAs, Physica Status Solidi. B: Basic research. WILEY-VCH Verlag GmbH & Co., 2004, 241: 317-320.

Luo Y.L., Zhao Y.W., Fung S.H.Y. and Beling C.D., Carrier injection level dependence of post-breakdown metastability in semi-insulating GaAs, Solid State Communications. Amsterdam, Elsevier Science, 2003, 127: 499-503.

Naik P.S., Beling C.D. and Fung S.H.Y., Design and implementation of a S-parameter wafer defect scanner, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 501-503.

Naik P.S., Beling C.D. and Fung S.H.Y., Design and implementation of a real-time positron imager, Proceeding of SPIE-IS&T Electronic Imaging. SPIE, 2004, 5297: 294-298.

Wang R., Beling C.D., Djurisic A., Li S. and Fung S.H.Y., Properties of ITO thin films deposited on amorphous and crystalline substrates with e-beam evaporation, Semiconductor Science and Technology. Bristol, IOP Publishing Limited, 2004, 19: 695-698.

Researcher : Cao Y

List of Research Outputs

Cao Y., Xie M.H., Liu Y., Ng Y.F., Wu H.S. and Tong S.Y., InN island shape and its dependence on growth condition of molecular-beam epitaxy, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 5157-5159.

Cao Y., Xie M.H., Liu Y., Xu S., Ng Y.F., Wu H.S. and Tong S.Y., Scaling of three-dimensional InN islands grown on GaN(0001) by molecular-beam epitaxy, Physical Review B (Rapid Communications). New York, The American Physical Society, 2003, 68: 161304:1-4.

Researcher : Chau HF

List of Research Outputs

Chau H.F. and Chow F.K., How to avoid fooling around in minority game?, InterJournal Complex Systems. New England Complex Systems Institute, 2004, 514:1-5.

Chau H.F., Chow F.K. and Ho K.H., Minority game with peer pressure, Physica A. Amsterdam, Elsevier B.V., 2004, 332: 483-495.

Chow F.K. and Chau H.F., Multichoice minority game: dynamics and global cooperation, Physica A. Amsterdam, Elsevier B.V., 2004, 337: 288-306.

Researcher : Cheah KW

List of Research Outputs

Wong K.L., Wong W.T. and Cheah K.W., Synthesis and Luminescence Study of Lanthanide Coordination Complexes , Abstract of The 8th International Symposium on Applied Bioinorganic Chemistry, 2-5 April 2004, Hong Kong. 2004, PP54.

Researcher : Chen X

List of Research Outputs

Chen X., Ling F.C.C., Fung S.H.Y., Beling C.D., Wu H.S., Brauer G., Anwand W. and Skorupa W., Deep level defects in He-implanted n-6H-SiC studied by deep level transient spectroscopy, Materials Research Society Symposium Proceedings. Materials Research Society, 2004, 815: J5.5.1- J5.5.6.

Chen X., Fung S.H.Y., Ling F.C.C., Beling C.D. and Gong M., Deep level transient spectroscopic study of neutron-irradiated n-type 6H-SiC, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 3004-3010.

Chen X., Gong M., Fung S.H.Y., Beling C.D. and Ling F.C.C., Deep level transient spectroscopy study of particle irradiation induced defects in n-6H-SiC, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 534.

Chen X., Yang C.L., Gong M., Ge W.K., Fung S.H.Y., Beling C.D., Wang J.N., Lui P.M.K. and Ling F.C.C., Low energy electron irradiation induced deep level defects in 6H–SiC: The implication for the microstructure of the deep levels E₁/E₂, Physical Review Letters. New York, The American Physical Society, 2004, 92: 125504:1-4.

Huang Y., Chen X., Fung S.H.Y., Beling C.D. and Ling F.C.C., Experimental study and modeling of the influence of screw dislocations on the performance of Au/n-GaN Schottky diodes, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 5771-5775.

Huang Y., Chen X., Beling C.D., Fung S.H.Y. and Ling F.C.C., Spatial distribution of carrier concentration in un-doped GaN film grown on sapphire, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 534.

Ling F.C.C., Chen X., Gong M., Weng H.M., Hang D.S., Beling C.D., Fung S.H.Y., Lam T.W. and Lam C.H., Identities of the deep level defects E₁/E₂ in 6H silicon carbide, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 135-137.

Ling F.C.C., Chen X. and Gong M., Microstructure of the deep level defect E1/E2 in 6H silicon carbide, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 904-905.

Lui P.M.K., Ling F.C.C., Chen X., Cheah K.W. and Li K.F., Acceptors in undoped gallium antimonide, Mat. Res. Soc. Symp. Proc. Materials Research Society, 2004, Z5.29.1-6.

Researcher : Chen Y

Project Title:	Pairing symmetry, competing orders and local physics in electron-doped high temperature superconductors
Investigator(s):	Dr. Chen Y., Prof. Wang Z.D., Prof. Zhang F.C.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	02/2004

Abstract:

To investigate the superconductivity and other competing orders, more specially, spin density wave; to investigate the existence of two possible types of superconducting order parameters at different pockets of the Fermi surface; to investigate the local electronic structure around impurities or vortex cores, both local density of states and nuclear magnetic resonance relaxation rate will be calculated.

List of Research Outputs

Chen Y. and Ting C.S., States of local moment induced by nonmagnetic impurities in cuprate superconductors, Physical Review Letters. New York, The American Physical Society, 2004, 92: 077203:1-4.

Yuan Q., Chen Y., Lee T.K. and Ting C.S., Fermi surface evolution in the antiferromagnetic state for the electron-doped t-t’-t’’-J model, Physical Review B. New York, The American Physical Society, 2004, 69: 214523:1-4.

Researcher : Cheng KS

Project Title:	High-energy radiation from pulsars - a three dimensional theoretical model and its applications
Investigator(s):	Prof. Cheng K.S.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	07/2001

Abstract:

To construct a three-dimensional pulsar magnetosphere model to explain the radiation features of high-energy photons from the pulsars; to construct a three-dimensional millisecond pulsar model to explain the radiation features of the X-rays and/or g-rays; to construct a model involving interaction between pulsar wind and supernova remnant to determine if these g-ray point sources are pulsars.

Project Title:	Phase transitions in rotating neutron stars
Investigator(s):	Prof. Cheng K.S.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2001
Completion Date:	10/2003

Abstract:

To study the internal properties of a rotating neutron star; to study when and how the quark matter can occur in the central region of a neutron star during its spin-down epoch due to the magnetic dipole radiation.

Project Title:	Consequences of spinning down neutron stars: cooling and change of internal properties
Investigator(s):	Prof. Cheng K.S.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	07/2002

Abstract:

This research aims at studying the properties of rotating neutron stars and their observational consequences. In particular, it includes studying the consequences of the phase transition during the spinning down epoch of neutron stars; understanding how the reduction of gravitational mass affects the orbital decay of the neutron stars; and developing an anisotropic transport equation.

Project Title:	Properties of strange stars and their observational appearance
Investigator(s):	Prof. Cheng K.S., Prof. Suen W.M., Prof. Usov V.V.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	07/2003

Abstract:

To study the emissivity and transport properties of electronmagnetic waves in semi-degenerate and inhomogeneous electron gas of the strange star atmosphere; the thermal emissivity of hot quark surface in electron-positron pairs; to calculate electron-positron pairs more precisely, hopefully with accuracy of ~10% or even higher; to study electromagnetic waves produced by passing the quarks and also the propagation of electromagnetic waves through the electron atmosphere, which is semi-degenerate and inhomogeneous; to study the strange star cooling by taking into account the processes mentioned in (1)-(3). And other processes such as formation of color-flavor locked phase inside the star, chiral symmetry requirement in the boundary, will be included in the cooling calculations; to study the observational consequences of producing strange stars by accretion including how much gravitational and phase transition energy will be released through gravitational and electromagnetic waves. The possible connection between this process and g-ray bursts will be studied as well.

Project Title:	Properties of strange stars and their observational appearance
Investigator(s):	Prof. Cheng K.S., Prof. Suen W.M., Prof. Usov V.V.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	07/2003

Abstract:

Project Title:	Time variation of fundamental physical constants in theories with extra-dimensions
Investigator(s):	Prof. Cheng K.S.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2003

Abstract:

To study in a systematically manner the possibility that the time variability of some fundamental physical constants (the elementary electric charge e, the speed of light c and the gravitational constant G) is due to the presence of the extra dimensions. More specifically, to consider the fundamental constants as some physical fields in a five-dimensional space-time and to examine the effects of such a hypothesis on the four-dimensional space-time.

List of Research Outputs

Cheng K.S., High-energy radiation from pulsars: a three-dimensional model approach, Advances in Space Research. Amsterdam, Elsevier, 2004, 33: 561-570.

Cheng K.S., Models of X-ray and Gamma-ray emission from pulsars, Conference Proceedings: Pulsars, AXPs and SGRs Observed with BeppoSAX and Other Observatories. 2003, 93-102.

Cheng K.S. and Taam R.E., On the origin of X-ray emission from millisecond pulsars in 47 Tucanae, The Astrophysical Journal. The American Astronomical Society, 2003, 598: 1207-1216.

Cheng K.S., Leung K.C. and Li T.P., Stellar Astrophysics: A Tribute to Helmut A. Abt. Amsterdam, Kluwer Academic Pub., 2003, i-xxvi,1-322.

Cheng K.S. and Harko T.C., Surface photon emissivity of bare strange stars, The Astrophysical Journal. The American Astronomical Society, 2003, 596: 451-463.

Cheng K.S. and Wang X.Y., The radio afterglow from the giant flare of SGR 1900+14: The same mechanism as afterglows from classic gamma-ray bursts?, The Astrophysical Journal Letters. The American Astronomical Society, 2003, 593: L85-L88.

Harko T.C., Cheng K.S. and Tang A.P.S., Nucleation of quark matter in neutron star cores, The Astrophysical Journal. The American Astronomical Society, 2004, 608: 945-956.

Huang Y.F., Lu T., Dai Z.G. and Cheng K.S., Beaming effects in gamma-ray burst afterglows, High Energy Processes and Phenomena in Astrophysics. International Astronomical Union Symposium, 2003, 214: 321-322.

Huang Y.F., Dai Z.G., Lu T., Cheng K.S. and Wu X.F., Gamma-ray bursts from neutron star kicks, The Astrophysical Journal. The American Astronomical Society, 2003, 594: 919-923.

Lin L.M., Cheng K.S., Suen W.M. and Chu M.C., Gravitational waves from phase-transition induced collapses of neutron stars, Stellar Astrophysics - A Tribute to Helmut A. Abt . Amsterdam, Kluwer Academic Pub., 2003, 245-247.

Wang X., Cheng K.S., Dai Z.G. and Lu T., Constraining the origin of TeV photons from gamma-ray bursts with delayed MeV-GeV emission formed by interaction with cosmic infrared/microwave background photons, Astrophysical Journal. The American Astronomical Society, 2004, 604: 306-311.

Zhang L., Cheng K.S., Jiang Z.J. and Leung P., Gamma-ray luminosity and death lines of pulsars with outer gaps, Astrophysical Journal. The American Astronomical Society, 2004, 604: 317-327.

Zhang X., Cheng K.S., Zhao G. and Hu S.M., Correlation between the gamma-ray and the near-infrared emissions from gamma-ray-loud blazars in the low state, Astrophysics and Space Science. Amsterdam, Kluwer Academic Pub., 2003, 286: 323-331.

Zhang X., Zhao G., Cheng K.S. and Zhang L., Gamma-ray and multiwaveband emission from gamma-ray-loud BL Lacertae objects, Chinese Physics Letters. Chinese Physical Society and IOP Publishing Limited, 2003, 20: 1183-1186.

Researcher : Cheng VKW

List of Research Outputs

Ho K.F., Beling C.D., Fung S.H.Y., Cheng V.K.W., Ng K.P. and Yip A.M., Deconvolution of positron annihilation coincidence Doppler broadening spectra using an iterative projected Newton method with non-negativity constraints, Review of Scientific Instruments. New York, American Institute of Physics, 2003, 74: 4779-4787.

Ho K.F., Ching A.H.M., Cheng V.K.W., Beling C.D., Fung S.H.Y. and Ng K.P., Optimized coincidence Doppler broadening spectroscopy using deconvolution algorithms, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 477-479.

Researcher : Cheung CK

List of Research Outputs

Cheung C.K., Kwan R.P.Y., Shan Y.Y., Naik P.S., Weng H., Beling C.D. and Fung S.H.Y., Millimeter positron focusing using a hybrid lens design, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 465-467.

Researcher : Cheung SH

List of Research Outputs

Xu S., Wang H.J., Cheung S.H., Li Q., Dai X., Xie M.H. and Tong D.S.Y., Shallow optically active structural defect in wurtzite GaN epilayers grown on stepped 4H-SiC substrates, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 3477-3479.

Researcher : Cheung YL

List of Research Outputs

Gao J., Kang L., Wong E.H.Y., Cheung Y.L. and Yang J., Improved epitaxy and surface morphology in YBa₂Cu₃O_y thin films grown on double buffered Si wafers, International Journal of Modern Physics B. Singapore, World Scientific, 2003, 17: 3695-3697.

Researcher : Chik TWD

List of Research Outputs

Chik T.W.D. and Wang Z., Postinhibitory rebound delay and weak synchronization in Hodgkin-Huxley neuronal networks, Physical Review E. New York, The American Physical Society, 2003, 68: 031907:1-7.

Researcher : Ching AHM

List of Research Outputs

Ho K.F., Ching A.H.M., Cheng V.K.W., Beling C.D., Fung S.H.Y. and Ng K.P., Optimized coincidence Doppler broadening spectroscopy using deconvolution algorithms, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 477-479.

Ho K.F., Ching A.H.M., Beling C.D., Fung S.H.Y., Ng K.P., Biasini M., Ferro G. and Gong M., Positron-electron autocorrelation function study of E-center in silicon, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 5549-5555.

Researcher : Chow FK

List of Research Outputs

Chau H.F. and Chow F.K., How to avoid fooling around in minority game?, InterJournal Complex Systems. New England Complex Systems Institute, 2004, 514:1-5.

Chau H.F., Chow F.K. and Ho K.H., Minority game with peer pressure, Physica A. Amsterdam, Elsevier B.V., 2004, 332: 483-495.

Chow F.K., Modeling the minority-seeking behavior in complex adaptive systems. Hong Kong, The University of Hong Kong, 2003, 1-108.

Chow F.K. and Chau H.F., Multichoice minority game: dynamics and global cooperation, Physica A. Amsterdam, Elsevier B.V., 2004, 337: 288-306.

Researcher : Chow FK

List of Research Outputs

Chau H.F. and Chow F.K., How to avoid fooling around in minority game?, InterJournal Complex Systems. New England Complex Systems Institute, 2004, 514:1-5.

Chau H.F., Chow F.K. and Ho K.H., Minority game with peer pressure, Physica A. Amsterdam, Elsevier B.V., 2004, 332: 483-495.

Chow F.K., Modeling the minority-seeking behavior in complex adaptive systems. Hong Kong, The University of Hong Kong, 2003, 1-108.

Chow F.K. and Chau H.F., Multichoice minority game: dynamics and global cooperation, Physica A. Amsterdam, Elsevier B.V., 2004, 337: 288-306.

Researcher : Dai X

List of Research Outputs

Dai X., Wu H.S., Xu S., Xie M.H. and Tong S.Y., Atomic design of polarity of GaN films grown on SiC(0001), Communications in Theoretical Physics. International Academic Pub., 2004, 41: 609-613.

Dai X., Wu H.S., Xie M.H., Xu S. and Tong S.Y., Nitrogen adatom diffusion on a Ga-rich GaN (0001) surface, Chinese Physics Letters. Chinese Physical Society and IOP Pub., 2004, 21: 527-529.

Dai X., Wu H.S., Xu S., Xie M.H. and Tong S.Y., Structural properties of GaN films grown on the 6H-SiC(0001) (sqrt{3} x sqrt{3}) R30^o substrate, Surface Review and Letters. Singapore, World Scientific, 2004, 11: 1-6.

Xie M.H., Zheng L., Dai X., Wu H.S. and Tong S.Y., A model for GaN ‘ghost’ islands, Surface Science. Amsterdam, Elsevier B.V., 2004, 558: 195-200.

Xu S., Wang H.J., Cheung S.H., Li Q., Dai X., Xie M.H. and Tong D.S.Y., Shallow optically active structural defect in wurtzite GaN epilayers grown on stepped 4H-SiC substrates, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 3477-3479.

Researcher : Djurisic A

Project Title:	Microcavity organic light emitting diodes
Investigator(s):	Dr. Djurisic A.B., Dr. Chan W.K., Dr. Lai P.T.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2002

Abstract:

The main objective of this project is the development of microcavity organic light-emitting diodes (OLEDs). Specifically, the project includes: 1) synthesis of novel organic materials suitable for microcavity OLED applications in either UV, or visible, or IR spectral region; 2) characterization of the optical properties of the materials to be used in fabrication of the microcavity OLEDs; 3) mirror design an fabrication, taking into account specific requirements for each spectral region considered; and 4) microcavity OLED design and fabrication for operation in one or more of the three spectral regions considered.

Project Title:	Stability of tris-(8-hydroxyquinoline) aluminum (Alq₃) based organic light emitting diodes
Investigator(s):	Dr. Djurisic A.B., Dr. Chan W.K.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	10/2002
Completion Date:	09/2003

Abstract:

To study the degradation mechanisms in Alq₃ based OLEDs and explore ways to improve the lifetime and stability of these devices.

Project Title:	Phthalocyanine based organic optoelectronic devices: doping, interfaces, and novel device structures
Investigator(s):	Dr. Djurisic A.B., Dr. Chan W.K.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	07/2003

Abstract:

To study the properties of phthalocyanine materials and their derivatives for applications in OLEDs and organic solar cells and, based on obtained results, to fabricate devices with superior performance.

Project Title:	ZnO micro- and nanostructures
Investigator(s):	Dr. Djurisic A.B.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	08/2003
Completion Date:	07/2004

Abstract:

To investigate the structural and the optical properties of ZnO samples prepared under different conditions in order to elucidate growth mechanisms and to investigate the origin of the visible (typically green) emission in ZnO.

Project Title:	Organic/inorganic nanocomposites for photovoltaic cells and organic light emitting diodes
Investigator(s):	Dr. Djurisic A.B., Dr. Chan W.K., Prof. Nunzi J.M., Dr. Sahraoui B.
Department:	Physics
Source(s) of Funding:	France/Hong Kong Joint Research Scheme
Start Date:	01/2004

Abstract:

To study the optical and charge transport properties in the organic/inorganic nanocomposites; to fabricate and characterize photovoltaic cells with improved performance based on organic/inorganic nanocomposites; to fabricate composite layers with improved charge transport and apply them to organic light emitting diodes (OLEDs).

List of Research Outputs

Chan J., Rakic A.D., Kwong C.Y., Djurisic A., Majewski M.L., Chan W.K. and Chui P.C., Optimization of organic light emitting diode structures, Proceeding of SPIE. Bellingham, SPIE, 2003, 5277: 311-319.

Chan S.H., Lam S.M.L., Tse C.W., Man K.Y.K., Wong W.T., Djurisic A. and Chan W.K., Photosensitivity of functional polystyrene and poly(methylmethacrylate) synthesized by controlled radical polymerization, Macromolecules. 1, 2003, 36: 5482-5490.

Chan W.K., Wong H.L., Man K.Y.K., Cheng K.W., Kwong C.Y. and Djurisic A., Effect of Photosensitizer Loading in Some Efficient Bulk Heterojunction Photovoltaic Cells Based on Rhenium(I) Dimine Complexes , International Conference on the Physics, Chemistry, and Engineering of Solar Cells (Badajoz, Spain), May 13-15, 2004.

Chan W.K., Wong H.L., Kwong C.Y., Hui C.S. and Djurisic A., Use of Metal-Containing Conjugated Polymers In Photovoltaic Devices, American Chemical Society 227th National Meeting (Anaheim, USA), March 26 - April 1, 2004 . 2004.

Djurisic A. and Rakic A.D., Asymmetric Bragg mirrors for the reduction of emission wavelength dependence on the viewing angle in organic microcavity light emitting diodes, Optics Communications. Amsterdam, Elsevier B.V., 2004, 236: 303-311.

Djurisic A., Lau T.W., Lam L.S.M. and Chan W.K., Influence of atmospheric exposure of tris (8-hydroxyquinoline) aluminum (Alq₃): a photoluminescence and absorption study, Applied Physics A. Berlin, Springer-Verlag, 2004, 78: 375-380.

Djurisic A., Kwong C.Y., Guo W., Liu Z.T., Kwok H.S. and Chan W.K., Spectroscopic ellipsometry of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA), Applied Physics A. Berlin, Springer-Verlag, 2003, 77: 649-653.

Djurisic A., Kwong C.Y., Lau T.W., Liu Z.T., Kwok H.S., Lam L.S.M. and Chan W.K., Spectroscopic ellipsometry of metal phthalocyanine thin films, Applied Optics. Washington, Optical Society of America, 2003, 42: 6382-6387.

Djurisic A., Leung Y.H., Choy W.C.H., Cheah K.W. and Chan W.K., Visible photoluminescence in ZnO tetrapod and multipod structures, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 2635-2637.

Hui C.S., Wong H.L., Kwong C.Y., Chan W.K. and Djurisic A., Fabrication of photovoltaic cell from rhenium containing polymer, Proceeding of SPIE. Bellingham, SPIE, 2003, 5215: 254-261.

Kwong C.Y., Djurisic A., Chui P.C. and Chan W.K., CuPc/C₆₀ solar cells - influence of the indium tin oxide substrate and device architecture on the solar cell performance, Japanese Journal of Applied Physics. Tokyo, The Japan Society of Applied Physics, 2004, 43: 1305-1311.

Kwong C.Y., Djurisic A., Chui P.C., Lam L.S.M. and Chan W.K., Improvement of the efficiency of phthalocyanine organic Schottky solar cells with ITO electrode treatment, Applied Physics A. Berlin, Springer-Verlag, 2003, 77: 555-560.

Kwong C.Y., Djurisic A., Chui P.C., Cheng K.W. and Chan W.K., Influence of solvent on film morphology and device performance of poly(3-hexylthiophene):TiO₂ nanocomposite solar cells, Chemical Physics Letters. Amsterdam, Elsevier B.V., 2004, 384: 372-375.

Kwong C.Y., Djurisic A., Chui P.C. and Chan W.K., Influence of the device architecture to the ITO surface treatment effects on organic solar cell performance, Proceeding of SPIE. Bellingham, SPIE, 2003, 5215: 153-160.

Kwong C.Y., Djurisic A., Roy V.A.L., Lai P.T. and Chan W.K., Influence of the substrate temperature to the performance of tris(8-hydroxyquinoline) aluminum based organic light emitting diodes, Thin Solid Films. Amsterdam, Elsevier B.V., 2004, 458: 281-286.

Leung Y.H., Djurisic A., Gao J., Xie M.H. and Chan W.K., Changing the shape of ZnO nanostructures by controlling Zn vapor release: from tetrapod to bone-like nanorods, Chemical Physics Letters. Amsterdam, Elsevier B.V., 2004, 385: 155-159.

Liu Z.T., Kwok H.S. and Djurisic A., The optical functions of metal phthalocyanines, Journal of Physics D: Applied Physics. Institute of Physics Publishing, 2004, 37: 678-688.

Man K.K.Y., Wong H.L., Chan W.K., Kwong C.Y. and Djurisic A., Efficient photodetectors fabricated from a metal-containing conjugated polymer by a multilayer deposition process, Chemistry of Materials. American Chemical Society, 2004, 16: 365-367.

Man K.K.Y., Cheng K.W., Wong H.L., Kwong C.Y., Chan W.K. and Djurisic A., Fabrication of photovoltaic cell from ruthenium containing polymer using layer by layer polyelectrolytes adsorption technique, Proceeding of SPIE. Bellingham, SPIE, 2003, 5215: 171-178.

Roy V.A.L., Kwong C.Y., Djurisic A., Pode R.B., Gundu Rao T.K. and Chan W.K., Improvement in the environmental stability of tris(8-hydroxyquinoline) aluminum by substitution of sulphonic acid in 8-hydroxyquinoline ligand, Proceeding of SPIE. Bellingham, SPIE, 2003, 5214: 283-290.

Roy V.A.L., Djurisic A., Chan W.K., Gao J., Lui H.F. and Surya C., Luminescent and structural properties of ZnO nanorods prepared under different conditions, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 141-143.

Roy V.A.L., Djurisic A., Liu H., Zhang X.X., Leung Y.H., Xie M.H., Gao J., Lui H.F. and Surya C., Magnetic properties of Mn doped ZnO tetrapod structures, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 756-758.

Roy V.A.L., Pode R.B., Gundu Rao T.K., Djurisic A. and Baldacchini G., Optical and ESR studies of Tris(8-hydroxyquinoline)aluminum, Materials Science and Engineering B. Amsterdam, Elsevier B.V., 2004, 106: 85-88.

Roy V.A.L., Djurisic A., Li Q., Xu S., Lui H.F., Surya C. and Gao J., Simple technique for bulk quantity synthesis of ZnO tetrapod nanorods, Proceeding of SPIE. Bellingham, SPIE, 2003, 5219: 51-58.

Wang R., Beling C.D., Djurisic A., Li S. and Fung S.H.Y., Properties of ITO thin films deposited on amorphous and crystalline substrates with e-beam evaporation, Semiconductor Science and Technology. Bristol, IOP Publishing Limited, 2004, 19: 695-698.

Wong H.L., Lam L.S.M., Cheng K.W., Man K.K.Y., Chan W.K., Kwong C.Y. and Djurisic A., Low-band-gap, sublimable rhenium(I) diimine complex for efficient bulk heterojunction photovoltaic devices, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 2557-2559.

Researcher : Fung SHY

Project Title:	Study of particle irradiation induced defects in silicon carbide
Investigator(s):	Prof. Fung S.H.Y., Prof. Gong M.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	12/2002

Abstract:

The project is concerned with the study of defects in silicon carbide (SiC), a modern wide bandgap semiconductor. For some semiconductors, the bombardment (irradiation) of the material by energetic particles such as electrons, neutrons adn protons can generate both desirable and undesirable defects. The project is a systematic study of all the defects (and their interaction with impurities present) resulting from electron, neutron and proton irradiation.

List of Research Outputs

Chen T.P., Liu Y., Tse M.S., Fung S.H.Y. and Dong G., Profile of optical constants of SiO₂ thin films containing Si nanocrystals, Journal of Applied Physics. New York, American Institute of Physics, 2004, 95: 8481-8483.

Chen X., Ling F.C.C., Fung S.H.Y., Beling C.D., Wu H.S., Brauer G., Anwand W. and Skorupa W., Deep level defects in He-implanted n-6H-SiC studied by deep level transient spectroscopy, Materials Research Society Symposium Proceedings. Materials Research Society, 2004, 815: J5.5.1- J5.5.6.

Chen X., Fung S.H.Y., Ling F.C.C., Beling C.D. and Gong M., Deep level transient spectroscopic study of neutron-irradiated n-type 6H-SiC, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 3004-3010.

Chen X., Gong M., Fung S.H.Y., Beling C.D. and Ling F.C.C., Deep level transient spectroscopy study of particle irradiation induced defects in n-6H-SiC, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 534.

Chen X., Yang C.L., Gong M., Ge W.K., Fung S.H.Y., Beling C.D., Wang J.N., Lui P.M.K. and Ling F.C.C., Low energy electron irradiation induced deep level defects in 6H–SiC: The implication for the microstructure of the deep levels E₁/E₂, Physical Review Letters. New York, The American Physical Society, 2004, 92: 125504:1-4.

Cheung C.K., Kwan R.P.Y., Shan Y.Y., Naik P.S., Weng H., Beling C.D. and Fung S.H.Y., Millimeter positron focusing using a hybrid lens design, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 465-467.

Ho K.F., Beling C.D., Fung S.H.Y., Cheng V.K.W., Ng K.P. and Yip A.M., Deconvolution of positron annihilation coincidence Doppler broadening spectra using an iterative projected Newton method with non-negativity constraints, Review of Scientific Instruments. New York, American Institute of Physics, 2003, 74: 4779-4787.

Ho K.F., Ching A.H.M., Cheng V.K.W., Beling C.D., Fung S.H.Y. and Ng K.P., Optimized coincidence Doppler broadening spectroscopy using deconvolution algorithms, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 477-479.

Ho K.F., Beling C.D., Fung S.H.Y., Biasini M., Ferro G. and Gong M., Positron-electron autocorrelation function study of E-center in Phosphorus-doped Silicon, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 111-113.

Ho K.F., Ching A.H.M., Beling C.D., Fung S.H.Y., Ng K.P., Biasini M., Ferro G. and Gong M., Positron-electron autocorrelation function study of E-center in silicon, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 5549-5555.

Huang Y., Chen X., Fung S.H.Y., Beling C.D. and Ling F.C.C., Experimental study and modeling of the influence of screw dislocations on the performance of Au/n-GaN Schottky diodes, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 5771-5775.

Huang Y., Chen X., Beling C.D., Fung S.H.Y. and Ling F.C.C., Spatial distribution of carrier concentration in un-doped GaN film grown on sapphire, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 534.

Lam C.H., Ling F.C.C., Beling C.D., Fung S.H.Y., Weng H.M. and Hang D.S., Vacancies in electron irradiated 6H silicon carbide studied by positron annihilation spectroscopy, Mat. Res. Soc. Symp. Proc. Materials Research Society, 2004, 792: R3.19.1-6.

Ling F.C.C., Chen X., Gong M., Weng H.M., Hang D.S., Beling C.D., Fung S.H.Y., Lam T.W. and Lam C.H., Identities of the deep level defects E₁/E₂ in 6H silicon carbide, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 135-137.

Liu Y., Chen T.P., Ng C.Y., Tse M.S., Fung S.H.Y., Liu Y.C., Li S. and Zhao P., Charging effect on electrical characteristics of MOS structures with Si nanocrystal distribution in gate oxide, Electrochemical and Solid-State Letters. The Electrochemical Society, Inc., 2004, 7: G134-G137.

Liu Y., Fu Y.Q., Chen T.P., Tse M.S., Fung S.H.Y., Hsieh J.H. and Yang X.H., Depth profiling of Si oxidation states in Si-implanted SiO₂ films by X-Ray photoelectron spectroscopy, Japanese Journal of Applied Physics. Tokyo, Japan Society of Applied Physics, 2003, 42: L1394-L1396.

Luo Y.L., Fung S.H.Y., Beling C.D., Ling F.C.C. and Li S., A search for defect configurational changes in the post-breakdown metastability of semi-insulating GaAs, Physica Status Solidi. B: Basic research. WILEY-VCH Verlag GmbH & Co., 2004, 241: 317-320.

Luo Y.L., Zhao Y.W., Fung S.H.Y. and Beling C.D., Carrier injection level dependence of post-breakdown metastability in semi-insulating GaAs, Solid State Communications. Amsterdam, Elsevier Science, 2003, 127: 499-503.

Naik P.S., Beling C.D. and Fung S.H.Y., Design and implementation of a S-parameter wafer defect scanner, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 501-503.

Naik P.S., Beling C.D. and Fung S.H.Y., Design and implementation of a real-time positron imager, Proceeding of SPIE-IS&T Electronic Imaging. SPIE, 2004, 5297: 294-298.

Wang R., Beling C.D., Djurisic A., Li S. and Fung S.H.Y., Properties of ITO thin films deposited on amorphous and crystalline substrates with e-beam evaporation, Semiconductor Science and Technology. Bristol, IOP Publishing Limited, 2004, 19: 695-698.

Researcher : Gao J

Project Title:	High Tc ramp-type Josephson junctions with a novel barrier
Investigator(s):	Dr. Gao J.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	10/1999

Abstract:

To study the synthesis and physical nature of ramp-type Josephson junctions with a new Nd2CuO4(NCO) barrier.

Project Title:	Epitaxial ramp structures with a continuously graded Y_xPr₁-_xBa₂Cu₃O_y for Josephson junctions
Investigator(s):	Dr. Gao J.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	10/2001

Abstract:

To develop a novel epitaxial ramp structure using a continually graded Y_xP₁-_xBCOO.

Project Title:	A new buffer layer Eu2CuO4 for growing YBCO epitaxial thin films
Investigator(s):	Dr. Gao J.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2001
Completion Date:	10/2003

Abstract:

To study the formation and growth of ECO layer; to investigate the epitaxy and superconductivity of YBCO grown on ECO buffered substrates.

Project Title:	Preparation of epitaxial YBa₂Cu₃O_y thin films on silicon with a double buffer of Eu₂CuO₄/YSZ
Investigator(s):	Dr. Gao J.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	10/2002

Abstract:

The project proposes to reveal the feasibility of applying a double buffer EuCuO(ECO)/YSZ to improve the growth of YBCO on Si. The synthesis process, resultant structural properties and their relation to superconductivity of YBCO films will be investigated. In addition, their crystalline and superconductivity, as well as the interfaces will be systematically studied.

Project Title:	Field and current effect in heteroepitaxial multiplayer structures of perovskite oxides
Investigator(s):	Dr. Gao J.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	07/2003

Abstract:

To develop heteroepitaxial structures based on perovskite transition metal oxides and to investigate the effect of electric field (or current) in such heterostructures, which has triggered intense scientific activity recently.

Project Title:	Current induced deduction on the peak resistance of perovskite transition metal oxides
Investigator(s):	Dr. Gao J.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2003

Abstract:

To study the influence of a transport current in the peak resistance of perovskite transition metal oxides.

List of Research Outputs

Gao J., Kang L., Wong E.H.Y., Cheung Y.L. and Yang J., Improved epitaxy and surface morphology in YBa₂Cu₃O_y thin films grown on double buffered Si wafers, International Journal of Modern Physics B. Singapore, World Scientific, 2003, 17: 3695-3697.

Hu F., Gao J., Sun J.R. and Shen B.G., Good rectifying characteristic in p-n junctions composed of La_0.67Ca_0.33MnO_3-δ/Nb-0.7 wt %-doped SrTiO₃, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 1869-1871.

Hu L., Gao J. and Shen S., Conductance modulations in spin field-effect transistors under finite bias voltages, Physical Review B. New York, The American Physical Society, 2004, 69: 165304:1-8.

Hu L., Gao J. and Shen S., Coulomb interaction in the spin Hall effect, Physical Review B (Brief Reports). New York, The American Physical Society, 2003, 68: 153303:1-4.

Hu L., Gao J. and Shen S., Influence of spin transfer and contact resistance on measurement of the spin Hall effect, Physical Review B. New York, The American Physical Society, 2003, 68: 115302:1-8.

Leung Y.H., Djurisic A., Gao J., Xie M.H. and Chan W.K., Changing the shape of ZnO nanostructures by controlling Zn vapor release: from tetrapod to bone-like nanorods, Chemical Physics Letters. Amsterdam, Elsevier B.V., 2004, 385: 155-159.

Liu C.X., Chen X.M., Wang Y., Xu M., Luo G.M., Mai Z.H., Tang W., Gao J., Jia Q.J., Zheng W.L. and Chen Z.J., Microstructural characterization of YBa₂Cu₃O_7-x thin films grown on Y-ZrO₂, Thin Solid Films. Amsterdam, Elsevier Science, 2003, 437: 272-275.

Roy V.A.L., Djurisic A., Chan W.K., Gao J., Lui H.F. and Surya C., Luminescent and structural properties of ZnO nanorods prepared under different conditions, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 141-143.

Roy V.A.L., Djurisic A., Liu H., Zhang X.X., Leung Y.H., Xie M.H., Gao J., Lui H.F. and Surya C., Magnetic properties of Mn doped ZnO tetrapod structures, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 756-758.

Roy V.A.L., Djurisic A., Li Q., Xu S., Lui H.F., Surya C. and Gao J., Simple technique for bulk quantity synthesis of ZnO tetrapod nanorods, Proceeding of SPIE. Bellingham, SPIE, 2003, 5219: 51-58.

So S.M. and Gao J., Preparation of ramp-type Josephson junctions using an Nd₂CuO₄ barrier, Journal of Physics D: Applied Physics. Bristol, Institute of Physics, 2003, 36: 2230-2233.

Tan W.S., Yang L., Sha H., Wu X.S., Gao J. and Jiang S.S., Surface structure and transport properties of YBa₂Cu₃O_7-δ using La_2/3Ca_1/3MnO₃ as buffer, Surface Review and Letters. Singapore, World Scientific, 2003, 10: 317-323.

Wu X., Tan W.S., Xu Y.M., Zhang E.M., Du J., Hu A., Jiang S.S. and Gao J., Structure and spin-gap in the normal state of Y_1-xCa_xBa_1.9Nd_0.1Cu₃O_y cuprates, Physica C. Amsterdam, Elsevier Science, 2003, 398: 131-140.

Wu X., Cai H.L., Xu Y.M., Tan W.S., Hu A., Jiang S.S. and Gao J., Thermal expansion and spin gap in the normal state of YBa₂Cu₃O_y with La doping and oxygen-deficiency, Physica C. Amsterdam, Elsevier B.V., 2004, 402: 88-93.

Researcher : Han Q

List of Research Outputs

Han Q., Xia T., Wang Z. and Li X.G., Impurity state of Nickel in the vortex core of d-wave superconductor, International Journal of Modern Physics B. Singapore, World Scientific, 2003, 17: 3604-3606.

Han Q., Xia T., Wang Z. and Li X.G., Impurity states in d-wave superconductors with a competing antiferromagnetic interaction, Physical Review B. New York, The American Physical Society, 2004, 69: 224512:1-9.

Han Q., Wang Z., Wang Q.H. and Xia T., Vortex state in Na_xCoO₂?yH₂O: p_x±ip_y–wave versus d_x²–y²±id_xy–wave pairing, Physical Review Letters. New York, The American Physical Society, 2004, 92: 027004:1-4.

Researcher : Hao J

Project Title:	Heteroepitaxial structures of strontium titanate thin films on silicon by laser molecular beam epitaxy
Investigator(s):	Dr. Hao J.H., Dr. Gao J.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	02/2004

Abstract:

Heteroepitaxy of high-quality SrTiO₃ (STO) thin films on Si substrates by laser molecular beam epitaxy (MBE); to investigate the structural, interfacial, electrical and dielectric properties in the heterointegration of epitaxial STO on Si.

List of Research Outputs

Lou Z. and Hao J., Cathodoluminescence of rare-earth-doped zinc aluminate films, Thin Solid Films. Amsterdam, Elsevier B.V., 2004, 450: 334-340.

Researcher : Hao JH

Project Title:	Heteroepitaxial structures of strontium titanate thin films on silicon by laser molecular beam epitaxy
Investigator(s):	Dr. Hao J.H., Dr. Gao J.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	02/2004

Abstract:

Researcher : Harko TC

List of Research Outputs

Chen C.M., Harko T.C., Kao W.F. and Mak M.K., Rotational perturbations of high density matter in the brane cosmology, Journal of Cosmology and Astroparticle Physics. Institute of Physics Publishing, 2003, 0311: 005.

Cheng K.S. and Harko T.C., Surface photon emissivity of bare strange stars, The Astrophysical Journal. The American Astronomical Society, 2003, 596: 451-463.

Harko T.C. and Mak M.K., Anisotropy in Bianchi-type brane cosmologies, Classical and Quantum Gravity. Bristol, IOP Publishing Limited, 2004, 21: 1489-1503.

Harko T.C., Gravitational collapse of a Hagedorn fluid in Vaidya geometry, Physical Review D. New York, The American Physical Society, 2003, 68: 064005:1-10.

Harko T.C., Cheng K.S. and Tang A.P.S., Nucleation of quark matter in neutron star cores, The Astrophysical Journal. The American Astronomical Society, 2004, 608: 945-956.

Harko T.C. and Mak M.K., Relativistic dissipative cosmological models and Abel differential equation, Computers and Mathematics with Applications. Amsterdam, Elsevier, 2003, 46: 849-853.

Harko T.C. and Mak M.K., Vacuum solutions of the gravitational field equations in the brane world model, Physical Review D. New York, The American Physical Society, 2004, 69: 064020:1-11.

Mak M.K. and Harko T.C., Full causal dissipative cosmologies with stiff matter, International Journal of Modern Physics D. Singapore, World Scientific, 2004, 13: 273-280.

Mak M.K. and Harko T.C., Quark stars admitting a one-parameter group of conformal motions, International Journal of Modern Physics D. Singapore, World Scientific, 2004, 13: 149-156.

Researcher : Ho KF

List of Research Outputs

Ho K.F., Beling C.D., Fung S.H.Y., Cheng V.K.W., Ng K.P. and Yip A.M., Deconvolution of positron annihilation coincidence Doppler broadening spectra using an iterative projected Newton method with non-negativity constraints, Review of Scientific Instruments. New York, American Institute of Physics, 2003, 74: 4779-4787.

Ho K.F., Ching A.H.M., Cheng V.K.W., Beling C.D., Fung S.H.Y. and Ng K.P., Optimized coincidence Doppler broadening spectroscopy using deconvolution algorithms, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 477-479.

Ho K.F., Beling C.D., Fung S.H.Y., Biasini M., Ferro G. and Gong M., Positron-electron autocorrelation function study of E-center in Phosphorus-doped Silicon, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 111-113.

Ho K.F., Ching A.H.M., Beling C.D., Fung S.H.Y., Ng K.P., Biasini M., Ferro G. and Gong M., Positron-electron autocorrelation function study of E-center in silicon, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 5549-5555.

Researcher : Ho KH

List of Research Outputs

Chau H.F., Chow F.K. and Ho K.H., Minority game with peer pressure, Physica A. Amsterdam, Elsevier B.V., 2004, 332: 483-495.

Researcher : Hu F

List of Research Outputs

Hu F., Gao J., Sun J.R. and Shen B.G., Good rectifying characteristic in p-n junctions composed of La_0.67Ca_0.33MnO_3-δ/Nb-0.7 wt %-doped SrTiO₃, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 1869-1871.

Researcher : Hu J

List of Research Outputs

Hu J., Macroscopic quantum phenomenon in molecular magnets. Hong Kong, The University of Hong Kong, 2003, 1-85.

Hu J., Chen Z.D. and Shen S., Quantum tunneling of two coupled single-molecular magnets, Physical Review B. New York, The American Physical Society, 2003, 68: 104407:1-5.

Researcher : Hu L

List of Research Outputs

Hu L., Gao J. and Shen S., Conductance modulations in spin field-effect transistors under finite bias voltages, Physical Review B. New York, The American Physical Society, 2004, 69: 165304:1-8.

Hu L., Gao J. and Shen S., Coulomb interaction in the spin Hall effect, Physical Review B (Brief Reports). New York, The American Physical Society, 2003, 68: 153303:1-4.

Hu L., Gao J. and Shen S., Influence of spin transfer and contact resistance on measurement of the spin Hall effect, Physical Review B. New York, The American Physical Society, 2003, 68: 115302:1-8.

Researcher : Huang Y

List of Research Outputs

Huang Y., Chen X., Fung S.H.Y., Beling C.D. and Ling F.C.C., Experimental study and modeling of the influence of screw dislocations on the performance of Au/n-GaN Schottky diodes, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 5771-5775.

Huang Y., Chen X., Beling C.D., Fung S.H.Y. and Ling F.C.C., Spatial distribution of carrier concentration in un-doped GaN film grown on sapphire, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 534.

Researcher : Hui CY

List of Research Outputs

Hui C.Y., Anisotropic heat transfer inside rotating neutron stars. Hong Kong, The University of Hong Kong, 2004, 1-95.

Researcher : Hui IP

List of Research Outputs

Wang H.Y., Weng H.M., Hang D.S., Zhou X.Y., Ye B.J., Fan Y.M., Han R.D., Ling F.C.C. and Hui I.P., Vacancy in 6H-Silicon Carbide studied by slow positron beam, Chinese Physics Letters. Chinese Physical Society and IOP Publishing Limited, 2003, 20: 1105-1108.

Researcher : Kang L

List of Research Outputs

Gao J., Kang L., Wong E.H.Y., Cheung Y.L. and Yang J., Improved epitaxy and surface morphology in YBa₂Cu₃O_y thin films grown on double buffered Si wafers, International Journal of Modern Physics B. Singapore, World Scientific, 2003, 17: 3695-3697.

Researcher : Kwan RPY

List of Research Outputs

Cheung C.K., Kwan R.P.Y., Shan Y.Y., Naik P.S., Weng H., Beling C.D. and Fung S.H.Y., Millimeter positron focusing using a hybrid lens design, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 465-467.

Researcher : Lam CH

List of Research Outputs

Lam C.H., Ling F.C.C., Beling C.D., Fung S.H.Y., Weng H.M. and Hang D.S., Vacancies in electron irradiated 6H silicon carbide studied by positron annihilation spectroscopy, Mat. Res. Soc. Symp. Proc. Materials Research Society, 2004, 792: R3.19.1-6.

Ling F.C.C., Chen X., Gong M., Weng H.M., Hang D.S., Beling C.D., Fung S.H.Y., Lam T.W. and Lam C.H., Identities of the deep level defects E₁/E₂ in 6H silicon carbide, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 135-137.

Researcher : Lam HC

List of Research Outputs

Leung J.K.C., Tso M.Y.W., Li S.H., Lam H.C., Poon T.A.S., Xiao D.T. and Zhou Q.F., An integrated particle sampler and lung radiation dosimeter, IEEE Transactions on Nuclear Science. IEEE, 2003, 50: 446-452.

Leung J.K.C., Tso M.Y.W., Lam H.C. and Zhau Q.F., Direct measurement of attachment of ²²⁰Rn progeny on aerosols by atomic force microscopy, Nuclear Instruments & Methods in Physics Research (Section A). Amsterdam, Elsevier Science B.V., 2003, 508: 512-518.

Researcher : Lam TW

List of Research Outputs

Ling F.C.C., Chen X., Gong M., Weng H.M., Hang D.S., Beling C.D., Fung S.H.Y., Lam T.W. and Lam C.H., Identities of the deep level defects E₁/E₂ in 6H silicon carbide, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 135-137.

Researcher : Leung JKC

Project Title:	A complete solution for assessing the radiation hazard of Rn-220 and its progeny in Hong Kong
Investigator(s):	Dr. Leung J.K.C.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	07/2003

Abstract:

To do a territory-wide survey of indoor 220Rn concentration in Hong Kong; to develop practical protocols for assessing the radiation hazard of indoor 220Rn and its progenies; to build a 220Rn exposure chamber suitable for calibrating all types of 220Rn measuring equipment; to assess the radiation hazard due to 220Rn and its progeny in Hong Kong; to recommend mitigation methods for reducing radiation hazard of indoor 220Rn and its progeny.

List of Research Outputs

Leung J.K.C., Tso M.Y.W., Li S.H., Lam H.C., Poon T.A.S., Xiao D.T. and Zhou Q.F., An integrated particle sampler and lung radiation dosimeter, IEEE Transactions on Nuclear Science. IEEE, 2003, 50: 446-452.

Leung J.K.C., Tso M.Y.W., Lam H.C. and Zhau Q.F., Direct measurement of attachment of ²²⁰Rn progeny on aerosols by atomic force microscopy, Nuclear Instruments & Methods in Physics Research (Section A). Amsterdam, Elsevier Science B.V., 2003, 508: 512-518.

Shang Z.R. and Leung J.K.C., ^110mAg root and foliar uptake in vegetables and its migration in soil, Journal of Environmental Radioactivity. Amsterdam, Elsevier Science, 2003, 65: 297-307.

Researcher : Leung P

List of Research Outputs

Leung P., A Monte Carlo study of the statistical properties of gamma-ray pulsars in the gould belt. Hong Kong, The University of Hong Kong, 2003, 1-73.

Zhang L., Cheng K.S., Jiang Z.J. and Leung P., Gamma-ray luminosity and death lines of pulsars with outer gaps, Astrophysical Journal. The American Astronomical Society, 2004, 604: 317-327.

Researcher : Leung P

List of Research Outputs

Leung P., A Monte Carlo study of the statistical properties of gamma-ray pulsars in the gould belt. Hong Kong, The University of Hong Kong, 2003, 1-73.

Zhang L., Cheng K.S., Jiang Z.J. and Leung P., Gamma-ray luminosity and death lines of pulsars with outer gaps, Astrophysical Journal. The American Astronomical Society, 2004, 604: 317-327.

Researcher : Leung YH

List of Research Outputs

Djurisic A., Leung Y.H., Choy W.C.H., Cheah K.W. and Chan W.K., Visible photoluminescence in ZnO tetrapod and multipod structures, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 2635-2637.

Leung Y.H., Djurisic A., Gao J., Xie M.H. and Chan W.K., Changing the shape of ZnO nanostructures by controlling Zn vapor release: from tetrapod to bone-like nanorods, Chemical Physics Letters. Amsterdam, Elsevier B.V., 2004, 385: 155-159.

Roy V.A.L., Djurisic A., Liu H., Zhang X.X., Leung Y.H., Xie M.H., Gao J., Lui H.F. and Surya C., Magnetic properties of Mn doped ZnO tetrapod structures, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 756-758.

Researcher : Li CF

List of Research Outputs

Li C.F., Searching for the existence of unusual nuclear shapes inside neutron stars. Hong Kong, The University of Hong Kong, 2003, 1-82.

Researcher : Li Q (Li Qing)

List of Research Outputs

Xu S., Li Q., Dong J.R. and Chua S.J., Interpretation of anomalous temperature dependence of anti-Stokes photoluminescence at GaInP₂/GaAs interface, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 2280-2282.

Xu S., Wang H.J., Cheung S.H., Li Q., Dai X., Xie M.H. and Tong D.S.Y., Shallow optically active structural defect in wurtzite GaN epilayers grown on stepped 4H-SiC substrates, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 3477-3479.

Researcher : Li S

List of Research Outputs

Li S., Development of a deep level optical spectroscopy system and its application to the study of defects in electron and neutron irradiated gallium nitride. Hong Kong, The University of Hong Kong, 2003, 1-157.

Luo Y.L., Fung S.H.Y., Beling C.D., Ling F.C.C. and Li S., A search for defect configurational changes in the post-breakdown metastability of semi-insulating GaAs, Physica Status Solidi. B: Basic research. WILEY-VCH Verlag GmbH & Co., 2004, 241: 317-320.

Wang R., Beling C.D., Djurisic A., Li S. and Fung S.H.Y., Properties of ITO thin films deposited on amorphous and crystalline substrates with e-beam evaporation, Semiconductor Science and Technology. Bristol, IOP Publishing Limited, 2004, 19: 695-698.

Researcher : Li S

List of Research Outputs

Researcher : Li TK

List of Research Outputs

Li T.K., Preparation and properties of epitaxial thin films of oxide materials with a perovskite structure. Hong Kong, The University of Hong Kong, 2003, 1-105.

Researcher : Lin LM

List of Research Outputs

Lin L.M., Cheng K.S., Suen W.M. and Chu M.C., Gravitational waves from phase-transition induced collapses of neutron stars, Stellar Astrophysics - A Tribute to Helmut A. Abt . Amsterdam, Kluwer Academic Pub., 2003, 245-247.

Researcher : Ling FCC

Project Title:	Ga vacancy related defects in gallium antimonide: the suspected residual acceptor?
Investigator(s):	Dr. Ling F.C.C.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2001
Completion Date:	10/2003

Abstract:

To study the correlations between the positron lifetime signal (which gives direct signal on vacancy type defect), the PL signal and the hole concentration with an aim to provide direct information concerning the identities of the residual acceptor and the 777 meV PL signal.

Project Title:	Positron annihilation spectroscopic studies of vacancy type defects in 6H-SiC: microstructural investigation of the material's deep level defects
Investigator(s):	Dr. Ling F.C.C., Dr. Beling C.D., Dr. Brauer G.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	12/2001

Abstract:

To identify and characterize the vacancy type defects in electron irradiated and ion-implanted 6H-SiC material with the use of the positron lifetime spectroscopy and the Doppler broadening technique; to correlate the PAS results with the DLTS results in order to clarify the ambiguity of the physical microstructure of the deep levels observed by DLTS.

Project Title:	Gaining direct chemical information around the vacancy defects in compound semiconductors by observing the corresponding positron-core-electron annihilation g radiation
Investigator(s):	Dr. Ling F.C.C., Dr. Beling C.D.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2002
Completion Date:	10/2004

Abstract:

To eliminate the background events by using the coincident technique and thus make the core electron spectroscopy becoking feasible; to employ this newly proposed technique to study the microstructure of vacancies in compound semiconductors.

Project Title:	Experimental studies of native defects in gallium antimonide
Investigator(s):	Dr. Ling F.C.C.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	12/2002

Abstract:

The project investigates the native defectsin GaSb with the four techniques, namely positron lifetime, deep level transient spectroscopy (DLTS), hall measurement, and photoluminescence. Correlation between defects detected by different spectroscopies will also be studied.

Project Title:	Threshold electron energy of defects in silicon carbide induced by electron irradiation: an approach to investigate the microstructures of some defects
Investigator(s):	Dr. Ling F.C.C., Dr. Chen X.D.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2003

Abstract:

To investigate the defects' physical identities in semiconductor, which plays a crucial role in determining the materials's electrical and optical properties, by monitoring the electron energy dependence of generating these defects in the energy range close to the defects' threshold displacement energies.

List of Research Outputs

Chen X., Ling F.C.C., Fung S.H.Y., Beling C.D., Wu H.S., Brauer G., Anwand W. and Skorupa W., Deep level defects in He-implanted n-6H-SiC studied by deep level transient spectroscopy, Materials Research Society Symposium Proceedings. Materials Research Society, 2004, 815: J5.5.1- J5.5.6.

Chen X., Fung S.H.Y., Ling F.C.C., Beling C.D. and Gong M., Deep level transient spectroscopic study of neutron-irradiated n-type 6H-SiC, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 3004-3010.

Chen X., Gong M., Fung S.H.Y., Beling C.D. and Ling F.C.C., Deep level transient spectroscopy study of particle irradiation induced defects in n-6H-SiC, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 534.

Chen X., Yang C.L., Gong M., Ge W.K., Fung S.H.Y., Beling C.D., Wang J.N., Lui P.M.K. and Ling F.C.C., Low energy electron irradiation induced deep level defects in 6H–SiC: The implication for the microstructure of the deep levels E₁/E₂, Physical Review Letters. New York, The American Physical Society, 2004, 92: 125504:1-4.

Huang Y., Chen X., Fung S.H.Y., Beling C.D. and Ling F.C.C., Experimental study and modeling of the influence of screw dislocations on the performance of Au/n-GaN Schottky diodes, Journal of Applied Physics. New York, American Institute of Physics, 2003, 94: 5771-5775.

Huang Y., Chen X., Beling C.D., Fung S.H.Y. and Ling F.C.C., Spatial distribution of carrier concentration in un-doped GaN film grown on sapphire, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 534.

Lam C.H., Ling F.C.C., Beling C.D., Fung S.H.Y., Weng H.M. and Hang D.S., Vacancies in electron irradiated 6H silicon carbide studied by positron annihilation spectroscopy, Mat. Res. Soc. Symp. Proc. Materials Research Society, 2004, 792: R3.19.1-6.

Ling F.C.C., Chen X., Gong M., Weng H.M., Hang D.S., Beling C.D., Fung S.H.Y., Lam T.W. and Lam C.H., Identities of the deep level defects E₁/E₂ in 6H silicon carbide, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 135-137.

Ling F.C.C., Chen X. and Gong M., Microstructure of the deep level defect E1/E2 in 6H silicon carbide, Bulletin of the American Physical Society. New York, The American Physical Society, 2004, 49: 904-905.

Lui P.M.K., Ling F.C.C., Chen X., Cheah K.W. and Li K.F., Acceptors in undoped gallium antimonide, Mat. Res. Soc. Symp. Proc. Materials Research Society, 2004, Z5.29.1-6.

Luo Y.L., Fung S.H.Y., Beling C.D., Ling F.C.C. and Li S., A search for defect configurational changes in the post-breakdown metastability of semi-insulating GaAs, Physica Status Solidi. B: Basic research. WILEY-VCH Verlag GmbH & Co., 2004, 241: 317-320.

Ma S.K.M., Ling F.C.C., Weng H.M. and Hang D.S., Undoped gallium antimonide studied by positron annihilation spectroscopy, Mat. Res. Soc. Symp. Proc. Materials Research Society, 2004, 799: Z5.30.1-6.

Wang H.Y., Weng H.M., Hang D.S., Zhou X.Y., Ye B.J., Fan Y.M., Han R.D., Ling F.C.C. and Hui I.P., Vacancy in 6H-Silicon Carbide studied by slow positron beam, Chinese Physics Letters. Chinese Physical Society and IOP Publishing Limited, 2003, 20: 1105-1108.

Weng H.M., Jia S.J., Ye B.J., Zhang X.F., Han R.D., Wang H.Y., Zhou X.Y., Zhang Z.C. and Ling F.C.C., Microstructure of carbon filled HDPE/EPDM composites studied by positron annihilation spectroscopy, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 358-360.

Researcher : Liu Y

List of Research Outputs

Cao Y., Xie M.H., Liu Y., Ng Y.F., Wu H.S. and Tong S.Y., InN island shape and its dependence on growth condition of molecular-beam epitaxy, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 5157-5159.

Cao Y., Xie M.H., Liu Y., Xu S., Ng Y.F., Wu H.S. and Tong S.Y., Scaling of three-dimensional InN islands grown on GaN(0001) by molecular-beam epitaxy, Physical Review B (Rapid Communications). New York, The American Physical Society, 2003, 68: 161304:1-4.

Researcher : Lu H

List of Research Outputs

Lu H., Geometric phases of mixed states in trapped ions. Hong Kong, The University of Hong Kong, 2003, 1-56.

Researcher : Lui PMK

List of Research Outputs

Chen X., Yang C.L., Gong M., Ge W.K., Fung S.H.Y., Beling C.D., Wang J.N., Lui P.M.K. and Ling F.C.C., Low energy electron irradiation induced deep level defects in 6H–SiC: The implication for the microstructure of the deep levels E₁/E₂, Physical Review Letters. New York, The American Physical Society, 2004, 92: 125504:1-4.

Lui P.M.K., Ling F.C.C., Chen X., Cheah K.W. and Li K.F., Acceptors in undoped gallium antimonide, Mat. Res. Soc. Symp. Proc. Materials Research Society, 2004, Z5.29.1-6.

Researcher : Ma PW

List of Research Outputs

Ma P.W. and Wang J., Dynamical conductance through InAs/GaSb/InAs and InAs/AlSb/GaSb/AlSb/InAs structures, Physical Review B. New York, The American Physical Society, 2004, 69: 125308:1-7.

Researcher : Ma SKM

List of Research Outputs

Ma S.K.M., Ling F.C.C., Weng H.M. and Hang D.S., Undoped gallium antimonide studied by positron annihilation spectroscopy, Mat. Res. Soc. Symp. Proc. Materials Research Society, 2004, 799: Z5.30.1-6.

Researcher : Mak MK

List of Research Outputs

Chen C.M., Harko T.C., Kao W.F. and Mak M.K., Rotational perturbations of high density matter in the brane cosmology, Journal of Cosmology and Astroparticle Physics. Institute of Physics Publishing, 2003, 0311: 005.

Harko T.C. and Mak M.K., Anisotropy in Bianchi-type brane cosmologies, Classical and Quantum Gravity. Bristol, IOP Publishing Limited, 2004, 21: 1489-1503.

Harko T.C. and Mak M.K., Relativistic dissipative cosmological models and Abel differential equation, Computers and Mathematics with Applications. Amsterdam, Elsevier, 2003, 46: 849-853.

Harko T.C. and Mak M.K., Vacuum solutions of the gravitational field equations in the brane world model, Physical Review D. New York, The American Physical Society, 2004, 69: 064020:1-11.

Mak M.K. and Harko T.C., Full causal dissipative cosmologies with stiff matter, International Journal of Modern Physics D. Singapore, World Scientific, 2004, 13: 273-280.

Researcher : Naik PS

List of Research Outputs

Cheung C.K., Kwan R.P.Y., Shan Y.Y., Naik P.S., Weng H., Beling C.D. and Fung S.H.Y., Millimeter positron focusing using a hybrid lens design, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 465-467.

Naik P.S., Beling C.D. and Fung S.H.Y., Design and implementation of a S-parameter wafer defect scanner, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 501-503.

Naik P.S., Beling C.D. and Fung S.H.Y., Design and implementation of a real-time positron imager, Proceeding of SPIE-IS&T Electronic Imaging. SPIE, 2004, 5297: 294-298.

Researcher : Ng YF

List of Research Outputs

Cao Y., Xie M.H., Liu Y., Ng Y.F., Wu H.S. and Tong S.Y., InN island shape and its dependence on growth condition of molecular-beam epitaxy, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 5157-5159.

Cao Y., Xie M.H., Liu Y., Xu S., Ng Y.F., Wu H.S. and Tong S.Y., Scaling of three-dimensional InN islands grown on GaN(0001) by molecular-beam epitaxy, Physical Review B (Rapid Communications). New York, The American Physical Society, 2003, 68: 161304:1-4.

Researcher : Poon TAS

List of Research Outputs

Leung J.K.C., Tso M.Y.W., Li S.H., Lam H.C., Poon T.A.S., Xiao D.T. and Zhou Q.F., An integrated particle sampler and lung radiation dosimeter, IEEE Transactions on Nuclear Science. IEEE, 2003, 50: 446-452.

Researcher : Pun JCS

Project Title:	Observational studies of supernovae
Investigator(s):	Dr. Pun J.C.S., Dr. Qiu Y.L.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	10/2002
Completion Date:	09/2003

Abstract:

To study bright nearby supernovae (SN) at the Beijing Astronomical Observatory (BAO); to monitor nearby supernovae for both their energy output (photometric imaging) and their chemical and physical conditions (spectroscopy); to establish a database to be used as a basis for comparisons with the present models on supernovae.

Project Title:	Understanding the nature of Supernova Remnant 1987A
Investigator(s):	Dr. Pun J.C.S.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2003

Abstract:

To study the Supermove Remnant ( SNR 1987A) in detail to gain insight on the explosion mechanism of the progenitor star, final stages of stellar evolution, and interaction with the circumstellar environment; to study SNR1987A system in detail: the explosion debris, the circumstellar rings, and the interaction between delmis and ring.

Project Title:	Understanding the nature of Supernova Remnant 1987A
Investigator(s):	Dr. Pun J.C.S.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	09/2003

Abstract:

List of Research Outputs

Michael E., McCray R., Chevalier R., Filippenko A.V., Lundqvist P., Challis P., Sugerman B., Lawrence S., Pun J.C.S., Garnavich P., Kirshner R., Crotts A., Fransson C., Li W., Panagia N., Phillips M., Schmidt B., Sonneborn G., Suntzeff N., Wang L. and Wheeler J.C., Hubble space telescope observations of high-velocity Lya and Ha emission from supernova remnant 1987A: The sturucture and development of the reverse shock, The Astrophysical Journal. The American Astronomical Society, 2003, 593: 809-830.

Researcher : Ren W

List of Research Outputs

Ren W., Electronic transport in the nanotube quantum dot. Hong Kong, The University of Hong Kong, 2003, 1-90.

Ren W. and Wang J., Electronic transport through single-wall nicked carbon nanotubes, Physical Review B (Brief Reports). New York, The American Physical Society, 2004, 69: 033306:1-4.

Researcher : Shan YY

List of Research Outputs

Cheung C.K., Kwan R.P.Y., Shan Y.Y., Naik P.S., Weng H., Beling C.D. and Fung S.H.Y., Millimeter positron focusing using a hybrid lens design, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 465-467.

Researcher : Shen S

Project Title:	Magnetic, charge and orbital orderings in doped transition-metal oxides: theoretical study
Investigator(s):	Dr. Shen S.Q., Prof. Wang Z.D.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	02/2000

Abstract:

To understand the physical mechanism of the formation of various types of charge, magnetic and orbital ordering states and its close relevance to the anomalous magnetic transport properties in the doped lanthanum manganese oxides.

Project Title:	Magnetic, charge and orbital orderings in doped transition-metal oxides: theoretical study
Investigator(s):	Dr. Shen S.Q., Prof. Wang Z.D.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	02/2000

Abstract:

Project Title:	Colossal magnetoresistance and percolation
Investigator(s):	Dr. Shen S.Q., Prof. Xie X.C.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2001

Abstract:

To understand the percolative transport properties and colossal magnetoresistance effect in ferromagnetic perovskite manganities.

Project Title:	Macroscopic quantum tunneling of magnetization in nano-magnetic molecules
Investigator(s):	Dr. Shen S.Q.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2001
Completion Date:	10/2003

Abstract:

To understand the physical mechanism of spin parity in quantum tunneling of magnetization and their relation to Berry phase in quantum mechanics.

Project Title:	Quantum ordered and disordered states in spin systems with orbital degeneracy
Investigator(s):	Dr. Shen S.Q., Prof. Zhang F.C.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2002

Abstract:

This project attempts to understand the role of electronic orbital degree of freedom in formation of various novel quantum states in transition metal oxides, and to develop new theoretical techniques to study the quantum spin liquid states and incommensurate spin density wave states.

Project Title:	Decoherence and non-exponential relaxation of quantum tunnelling in nano-magnetic molecules
Investigator(s):	Dr. Shen S.Q., Dr. Chen Z.D.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2002

Abstract:

To understand the physical mechanism of decoherence and non-exponential relaxation in quantum tunnelling in nano-magnetic molecules.

Project Title:	Local stray field and macroscopic quantum tunneling in nanometer-sized magnetic particles and clusters
Investigator(s):	Dr. Shen S.Q.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	10/2003

Abstract:

To understand the role of environmental interaction in quantum tunneling and decoherence from the magnetization reversal in nanometer-sized clusters, to establish an efficient method to deduce microscopic parameters from the experimental data, to study the novel properties of newly synthesized supramolecular dimers, and to explore possible application in magnetic memory and information industry.

Project Title:	Local stray field and macroscopic quantum tunneling in nanometer-sized magnetic particles and clusters
Investigator(s):	Dr. Shen S.Q.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	10/2003

Abstract:

Project Title:	Quantum spin transport and geometric phases
Investigator(s):	Dr. Shen S.Q.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2003

Abstract:

To understand the relation between quantum spin transport and geometric phases in some mesocopic structures where spin and charge currents could arise from the spin interference.

List of Research Outputs

Chen Z.D., Liang J.Q., Shen S. and Xie W.F., Dynamics and Berry phase of two-species Bose-Einstein condensates, Physical Review A. New York, The American Physical Society, 2004, 69: 023611:1-9.

Hu J., Chen Z.D. and Shen S., Quantum tunneling of two coupled single-molecular magnets, Physical Review B. New York, The American Physical Society, 2003, 68: 104407:1-5.

Hu L., Gao J. and Shen S., Conductance modulations in spin field-effect transistors under finite bias voltages, Physical Review B. New York, The American Physical Society, 2004, 69: 165304:1-8.

Hu L., Gao J. and Shen S., Coulomb interaction in the spin Hall effect, Physical Review B (Brief Reports). New York, The American Physical Society, 2003, 68: 153303:1-4.

Hu L., Gao J. and Shen S., Influence of spin transfer and contact resistance on measurement of the spin Hall effect, Physical Review B. New York, The American Physical Society, 2003, 68: 115302:1-8.

Shen S., Li Z.J. and Ma Z., Controllable quantum spin precession by Aharonov-Casher phase in a conducting ring, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 996-998.

Shen S., Ma M., Xie X.C. and Zhang F., Resonant spin Hall conductance in two-dimensional electron systems with a Rashba interaction in a perpendicular magnetic field, Physical Review Letters. New York, The American Physical Society, 2004, 92: 256603:1-4.

Zhou B., Tao R.B. and Shen S., Quantum-classical transition of the escape rate of uniaxial antiferromagnetic particles in an arbitrarily directed field, Physical Review B. New York, The American Physical Society, 2003, 68: 214423:1-6.

Researcher : So SM

List of Research Outputs

So S.M. and Gao J., Preparation of ramp-type Josephson junctions using an Nd₂CuO₄ barrier, Journal of Physics D: Applied Physics. Bristol, Institute of Physics, 2003, 36: 2230-2233.

Researcher : Tang APS

List of Research Outputs

Harko T.C., Cheng K.S. and Tang A.P.S., Nucleation of quark matter in neutron star cores, The Astrophysical Journal. The American Astronomical Society, 2004, 608: 945-956.

Researcher : Tang W

List of Research Outputs

Liu C.X., Chen X.M., Wang Y., Xu M., Luo G.M., Mai Z.H., Tang W., Gao J., Jia Q.J., Zheng W.L. and Chen Z.J., Microstructural characterization of YBa₂Cu₃O_7-x thin films grown on Y-ZrO₂, Thin Solid Films. Amsterdam, Elsevier Science, 2003, 437: 272-275.

Researcher : To CN

List of Research Outputs

To C.N., Phase separation in Poly(Styrene-B-Ethylene oxide) thin films on different substrates. Hong Kong, The University of Hong Kong, 2003, 1-96.

Researcher : Tong DSY

List of Research Outputs

Xu S., Wang H.J., Cheung S.H., Li Q., Dai X., Xie M.H. and Tong D.S.Y., Shallow optically active structural defect in wurtzite GaN epilayers grown on stepped 4H-SiC substrates, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 3477-3479.

Zhao D., Xu S., Xie M.H., Tong D.S.Y. and Yang H., Stress and its effect on optical properties of GaN epilayers grown on Si(111), 6H-SiC(0001), and c-plane sapphire, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 677-679.

Researcher : Wang B

List of Research Outputs

Wang B., Wang J. and Guo H., Current plateaus of nonadiabatic charge pump: Multiphoton assisted processes, Physical Review B. New York, The American Physical Society, 2003, 68: 155326:1-7.

Wang B., Wang J. and Guo H., Shot noise of spin current, Physical Review B (Brief Reports). New York, The American Physical Society, 2004, 69: 153301:1-4.

Wang B., Wang J., Wang J. and Xing D.Y., Spin current carried by magnons, Physical Review B. New York, The American Physical Society, 2004, 69: 174403:1-5.

Zheng W., Wu J., Wang B., Wang J., Sun Q. and Guo H., Parametric quantum spin pump, Physical Review B (Brief Reports). New York, The American Physical Society, 2003, 68: 113306:1-3.

Researcher : Wang H

List of Research Outputs

Wang H., Spectroscopic investigation of optical properties of GaN epilayers and InGaN/GaN quantum wells. Hong Kong, The University of Hong Kong, 2003, 1-87.

Researcher : Wang HJ

List of Research Outputs

Xu S., Wang H.J., Cheung S.H., Li Q., Dai X., Xie M.H. and Tong D.S.Y., Shallow optically active structural defect in wurtzite GaN epilayers grown on stepped 4H-SiC substrates, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 3477-3479.

Researcher : Wang J

Project Title:	Quantum transport in carbon nanotube based devices
Investigator(s):	Dr. Wang J.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2001
Completion Date:	10/2004

Abstract:

To investigate the I-V characteristics and the shot noise spectrum of various molecular devices based on CNT using the first principle calculation; to investigate the photon assisted tunneling through CNT devices using the nonequilibrium Green's function approach; to study the frequency dependent shot noise of CNT devices.

Project Title:	Quantum transport through carbon nanotube based devices
Investigator(s):	Dr. Wang J.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	12/2001

Abstract:

To investigate I-V characteigtics and the shot noise spectrum of carbon nanotube based devices; to study photom assisted tunnoling through carbon nanotube based devices; to study electrom pumping for carbon nanotube devices.

Project Title:	First principle study of I-V characteristics of nanoclusters and compound semiconductor nanowires
Investigator(s):	Dr. Wang J.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2002

Abstract:

Nanometer electro-mechanical systems (NEMS) technology holds the promise of molecular computing, along with new classes of devices for ultra-sensitive probes and detectors. The project aims at investigating the fundamental properties of NEMS by exploiting a new, powerful and possibly unique simulation tool that can generate ab initio I-V curves self-consistently at a density functional level. The code is suitable for open quantum systems and uses a real-space orbital basis set, and constructs the charge density from non-equilibrium Green's functions. With this code, the research team will explore the transport properties such as the dynamic conductance, electrochemical capacitance, as well as I-V curves of paradigmatic NEMS devices based on nanoclusters.

Project Title:	Theoretical investigation of dynamic response, fluctuations, and charge relaxation in nano-conductors
Investigator(s):	Dr. Wang J.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2002

Abstract:

To develop a general current conserving and gauge invariant transport theory for the nanoscopic systems using the non-equilibrium Green's function approach when the system is driven to far from equilibrium.

Project Title:	First principle calculation of transport properties of hybrid superconducting nanostructures
Investigator(s):	Dr. Wang J.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	09/2003

Abstract:

To study DC transport through hybrid superconducting nanostructures; to study AC cument through hybrid superconducting nanostructures; to study the shot noise of hybrid superconducting nanostructures.

Project Title:	First principle calculation of transport properties of hybrid superconducting nanostructures
Investigator(s):	Dr. Wang J.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2003

Abstract:

Project Title:	Parametric pumping in nanostructures
Investigator(s):	Dr. Wang J.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2003

Abstract:

To extend the previous parametric electron pumping theory to include the spin polarized pumping effect, and to examine the spin valve effect for the pumped current.

List of Research Outputs

Hsue Y.C., Yang T.J., Gu B.Y. and Wang J., Andreev scattering in semiconductor-superconductor junctions containing a finite width semiconductor region applied by magnetic fields, Journal of the Physical Society of Japan. The Physical Society of Japan, 2004, 73: 1303-1312.

Hsue Y.C., Yang T.J., Gu B.Y. and Wang J., Magnetoconductance oscillations in semiconductor-superconductor junctions with a laterally isolating barrier layer inside semiconductor region, European Physical Journal B. EDP Sciences, 2003, 34: 237-246.

Long W., Sun Q.F., Guo H. and Wang J., Gate-controllable spin battery, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 1397-1399.

Ma P.W. and Wang J., Dynamical conductance through InAs/GaSb/InAs and InAs/AlSb/GaSb/AlSb/InAs structures, Physical Review B. New York, The American Physical Society, 2004, 69: 125308:1-7.

Ren W. and Wang J., Electronic transport through single-wall nicked carbon nanotubes, Physical Review B (Brief Reports). New York, The American Physical Society, 2004, 69: 033306:1-4.

Sun Q.F., Guo H. and Wang J., Correlated two-electron transport: A principle for a charge pump, Physical Review B. New York, The American Physical Society, 2003, 68: 035318:1-5.

Sun Q.F., Guo H. and Wang J., Spin-current-induced electric field, Physical Review B. New York, The American Physical Society, 2004, 69: 054409:1-5.

Wang B., Wang J. and Guo H., Current plateaus of nonadiabatic charge pump: Multiphoton assisted processes, Physical Review B. New York, The American Physical Society, 2003, 68: 155326:1-7.

Wang B., Wang J. and Guo H., Shot noise of spin current, Physical Review B (Brief Reports). New York, The American Physical Society, 2004, 69: 153301:1-4.

Wang B., Wang J., Wang J. and Xing D.Y., Spin current carried by magnons, Physical Review B. New York, The American Physical Society, 2004, 69: 174403:1-5.

Zhao H.K. and Wang J., Coherent mesoscopic transport through a quantum-dot embedded carbon nanotube ring threaded with magnetic flux, Physics Letters A. Amsterdam, Elsevier B.V., 2004, 323: 285-289.

Zheng W., Wu J., Wang B., Wang J., Sun Q. and Guo H., Parametric quantum spin pump, Physical Review B (Brief Reports). New York, The American Physical Society, 2003, 68: 113306:1-3.

Researcher : Wang R

List of Research Outputs

Wang R., Beling C.D., Djurisic A., Li S. and Fung S.H.Y., Properties of ITO thin films deposited on amorphous and crystalline substrates with e-beam evaporation, Semiconductor Science and Technology. Bristol, IOP Publishing Limited, 2004, 19: 695-698.

Researcher : Wang X

List of Research Outputs

Wang X., Cheng K.S., Dai Z.G. and Lu T., Constraining the origin of TeV photons from gamma-ray bursts with delayed MeV-GeV emission formed by interaction with cosmic infrared/microwave background photons, Astrophysical Journal. The American Astronomical Society, 2004, 604: 306-311.

Researcher : Wang ZD

Project Title:	Tunneling currents across hybrid structures consisting of unconventional superconductors
Investigator(s):	Prof. Wang Z.D., Dr. Zhang W.Y.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2001

Abstract:

To study the impurity effect, particularly the interface roughness, on tunneling currents across c-axis junctions consisting of a d-wave-superconductor and an S-wave-superconductor; to study the tunneling conductance of Ferro-magnet/d-wave-superconductor (FM/SC) junctions; to study injection of spin-polarized charge carriers in FM/SC junctions.

Project Title:	Theoretical studies on superconducting devices
Investigator(s):	Prof. Wang Z.D.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2001
Completion Date:	10/2003

Abstract:

To understand profoundly novel phenomena observed and to predict some new features of these junctions/devices as well as to design some new devices.

Project Title:	Superconductor science and technology
Investigator(s):	Prof. Wang Z.D.
Department:	Physics
Source(s) of Funding:	PVC(R)'s China Collaboration Budget
Start Date:	02/2002

Abstract:

To carry out investigation on superconductor science and technology.

Project Title:	Nonadiabatic geometric phases and their applications in fault-tolerant quantum computation
Investigator(s):	Prof. Wang Z.D., Prof. Duan L.M.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	07/2002

Abstract:

Quantum computers can solve efficiently significant sets of problems believed to be intractable for classical computers. The current project is to use non-adiabatic geometric operations with fast running speed to realize geometric quantum computation, which may provide a method to overcome the intrinsic difficulty in adiabatic geometric operations associated with the slow gate speed.

Project Title:	Quantum logic gates based on cyclic geometric phases
Investigator(s):	Prof. Wang Z.D.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2002

Abstract:

To design a set of quantum logic gates in quantum computing operations with fast running speed based on cyclic geometric phases, which may provide a method to overcome the intrinsic difficulty in adiabatic geometric operations associated with the slow gate speed.

Project Title:	Theoretical studies of impurity and vortex states in high temperature superconductors
Investigator(s):	Prof. Wang Z.D.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2003

Abstract:

To carry out a systematic and detailed study on the mechanism of IRS in high temperature superconductors(HTS) with particular attention being paid to its magnetic-related origin. It is expected that the study of the variation of IRS with the doping content and accordingly the response of the local moments carried/induced by impurities to the anti-ferromagnetic correlations may help us to clarify the origin of the IRS in HTS; to study theoretically (a) the local electronic structure at vortex cores and the vortex charge in the presence of the orbital AF phase(d-density wave) recently proposed to explain the PG state; and (b) the variation of IRS in response to various spin or charge order parameters by pinning vortices on the imputities as the resonance state is very sensitive to the nature of the electronic structure where the impurity is embedded. In terms of our results, we may be able to understand profoundly some existing experimental results as well as to suggest new experiments to test some predictions.

Project Title:	Theoretical studies of impurity and vortex states in high temperature superconductors
Investigator(s):	Prof. Wang Z.D.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	09/2003

Abstract:

Project Title:	Vortex state and impurity effect in newly discovered NaCoO superconductors
Investigator(s):	Prof. Wang Z.D.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	11/2003

Abstract:

To study theoretically vortex state and impurity effect in the novel superconductors with triangular lattices.

List of Research Outputs

Chik T.W.D. and Wang Z., Postinhibitory rebound delay and weak synchronization in Hodgkin-Huxley neuronal networks, Physical Review E. New York, The American Physical Society, 2003, 68: 031907:1-7.

Han Q., Xia T., Wang Z. and Li X.G., Impurity state of Nickel in the vortex core of d-wave superconductor, International Journal of Modern Physics B. Singapore, World Scientific, 2003, 17: 3604-3606.

Han Q., Xia T., Wang Z. and Li X.G., Impurity states in d-wave superconductors with a competing antiferromagnetic interaction, Physical Review B. New York, The American Physical Society, 2004, 69: 224512:1-9.

Han Q., Wang Z., Wang Q.H. and Xia T., Vortex state in Na_xCoO₂?yH₂O: p_x±ip_y–wave versus d_x²–y²±id_xy–wave pairing, Physical Review Letters. New York, The American Physical Society, 2004, 92: 027004:1-4.

He G.P., Zhu S., Wang Z. and Li H.Z., Testing Bell's inequality and measuring the entanglement using superconducting nanocircuits, Physical Review A. New York, The American Physical Society, 2003, 68: 012315:1-6.

Wang Q.H. and Wang Z., Impurity and interface bound states in d_x²–y² + id_xy and p_x + ip_y superconductors, Physical Review B (Brief Reports). New York, The American Physical Society, 2004, 69: 092502:1-4.

Wang Z.X., Zhang W.Y. and Wang Z., Order parameter and current-phase relation in Josephson junctions composed of g + s-wave superconductors, Physical Review B. New York, The American Physical Society, 2003, 68: 184516:1-7.

Yang K., Zhu S. and Wang Z., Universal quantum gates based on both geometric and dynamic phases in quantum dots, Chinese Physics Letters. Chinese Physical Society and IOP Publishing Limited, 2003, 20: 991-994.

Zheng R.K., Li G., Tang A.N., Yang Y., Wang W., Li X.G., Wang Z. and Ku H.C., The role of the cooperative Jahn-Teller effect in the charge-ordered La_1-xCa_xMnO₃ (0.5<=x<=0.87) manganites, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 5250-5252.

Zhu S., Wang Z. and Yang K., Quantum-information processing using Josephson junctions coupled through cavities, Physical Review A. New York, The American Physical Society, 2003, 68: 034303:1-4.

Zhu S. and Wang Z., Unconventional geometric quantum computation, Physical Review Letters. New York, The American Physical Society, 2003, 91: 187902:1-4.

Zhu S.L. and Wang Z., Geometric quantum computation, Physics. Beijing, Chinese Physical Society, 2004, 33: 242-245.

Researcher : Weng H

List of Research Outputs

Cheung C.K., Kwan R.P.Y., Shan Y.Y., Naik P.S., Weng H., Beling C.D. and Fung S.H.Y., Millimeter positron focusing using a hybrid lens design, Materials Science Forum. Switzerland, Trans Tech Publications, 2004, 445-446: 465-467.

Researcher : Wong EHY

List of Research Outputs

Gao J., Kang L., Wong E.H.Y., Cheung Y.L. and Yang J., Improved epitaxy and surface morphology in YBa₂Cu₃O_y thin films grown on double buffered Si wafers, International Journal of Modern Physics B. Singapore, World Scientific, 2003, 17: 3695-3697.

Wong E.H.Y., Fabrication and characterization of epitaxial YBa₂Cu₃O_y thin films on double-buffered silicon substrates. Hong Kong, The University of Hong Kong, 2003, 1-119.

Researcher : Woo KT

List of Research Outputs

Woo K.T., Some mathematical studies in least square deconvolution of positron doppler broadening spectra using huber regularization. Hong Kong, The University of Hong Kong, 2003, 1-141.

Researcher : Wu HS

Project Title:	Determine atomic structures with Paterson inversion of LEED-IV curves
Investigator(s):	Dr. Wu H.S.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	05/2000

Abstract:

To use a global background for all IV curves rather than an individual background for each IV curve that cauese loss of some useful structure information; to use multi-incidence Paterson inversion to replace single-incidence Paterson inversion to significantly reduce the noise; to use two steps to identify true model and obtain the final structure by fitting models to Paterson function.

Project Title:	Determine atomic structures with Paterson inversion of LEED-IV curves
Investigator(s):	Dr. Wu H.S.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	05/2000

Abstract:

Project Title:	Combined LEED-IV direct imaging and curve fitting to study complex surface structures
Investigator(s):	Dr. Wu H.S.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2000

Abstract:

To develop an accurate LEED-IV and STM measurement on systems with large unit cells. Coupled to the experimental effort, the project will combine LEED-IV direct imaging techniques and curve fitting approach to determine the structures.

Project Title:	Reference-selective holographic inversion of LEED spectra -- a new method to determine the final atomic structure model
Investigator(s):	Dr. Wu H.S.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	02/2002
Completion Date:	01/2004

Abstract:

To fully explore the advantages of the direct inversions of LEED spectra and to determine the atomic structures of several interesting systems.

Project Title:	Reference-selective holographic inversion of LEED spectra: a novel method to determine the final atomic structure model
Investigator(s):	Dr. Wu H.S.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	12/2002

Abstract:

The goal of this project is to fully explore the advantages of the direct inversions of LEED spectra and to determine the atomic structures of several interesting systems.

Project Title:	Investigation of pure cubic GaN film growth on SiC(0001) substrate
Investigator(s):	Dr. Wu H.S.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	12/2003

Abstract:

To investigate (1) surface structures of 6H-Sic(0001) surfaces; (2) the interface structures of GaN films/GH SiC(0001); (3) the surface structures of GaN films; (4) the growth condition dependence of the critical thickness of GaN film; (5) the driving force for cubic film growth and inversion from cubic to hexagonal; (6)the possible ways to control the critical thickness of cubic GaN film.

Project Title:	Investigation of pure cubic GaN film growth on SiC(0001) substrate
Investigator(s):	Dr. Wu H.S.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	12/2003

Abstract:

List of Research Outputs

Cao Y., Xie M.H., Liu Y., Ng Y.F., Wu H.S. and Tong S.Y., InN island shape and its dependence on growth condition of molecular-beam epitaxy, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 5157-5159.

Cao Y., Xie M.H., Liu Y., Xu S., Ng Y.F., Wu H.S. and Tong S.Y., Scaling of three-dimensional InN islands grown on GaN(0001) by molecular-beam epitaxy, Physical Review B (Rapid Communications). New York, The American Physical Society, 2003, 68: 161304:1-4.

Chen X., Ling F.C.C., Fung S.H.Y., Beling C.D., Wu H.S., Brauer G., Anwand W. and Skorupa W., Deep level defects in He-implanted n-6H-SiC studied by deep level transient spectroscopy, Materials Research Society Symposium Proceedings. Materials Research Society, 2004, 815: J5.5.1- J5.5.6.

Dai X., Wu H.S., Xu S., Xie M.H. and Tong S.Y., Atomic design of polarity of GaN films grown on SiC(0001), Communications in Theoretical Physics. International Academic Pub., 2004, 41: 609-613.

Dai X., Wu H.S., Xie M.H., Xu S. and Tong S.Y., Nitrogen adatom diffusion on a Ga-rich GaN (0001) surface, Chinese Physics Letters. Chinese Physical Society and IOP Pub., 2004, 21: 527-529.

Dai X., Wu H.S., Xu S., Xie M.H. and Tong S.Y., Structural properties of GaN films grown on the 6H-SiC(0001) (sqrt{3} x sqrt{3}) R30^o substrate, Surface Review and Letters. Singapore, World Scientific, 2004, 11: 1-6.

Xie M.H., Zheng L., Dai X., Wu H.S. and Tong S.Y., A model for GaN ‘ghost’ islands, Surface Science. Amsterdam, Elsevier B.V., 2004, 558: 195-200.

Xu S., Wu H.S., Tong S.Y., Keeffe M., Lapeyre G.J. and Rotenberg E., Study of the C₂H₄/Si(100)-(2 x 1) interface by derivative photoelectron holography, Surface Review and Letters. Singapore, World Scientific, 2003, 10: 925-932.

Researcher : Wu J

List of Research Outputs

Wu J., Frequency-dependent quantum transport through nano-devices. Hong Kong, The University of Hong Kong, 2004, 1-101.

Zheng W., Wu J., Wang B., Wang J., Sun Q. and Guo H., Parametric quantum spin pump, Physical Review B (Brief Reports). New York, The American Physical Society, 2003, 68: 113306:1-3.

Researcher : Wu X

List of Research Outputs

Wu X., Tan W.S., Xu Y.M., Zhang E.M., Du J., Hu A., Jiang S.S. and Gao J., Structure and spin-gap in the normal state of Y_1-xCa_xBa_1.9Nd_0.1Cu₃O_y cuprates, Physica C. Amsterdam, Elsevier Science, 2003, 398: 131-140.

Wu X., Cai H.L., Xu Y.M., Tan W.S., Hu A., Jiang S.S. and Gao J., Thermal expansion and spin gap in the normal state of YBa₂Cu₃O_y with La doping and oxygen-deficiency, Physica C. Amsterdam, Elsevier B.V., 2004, 402: 88-93.

Researcher : Xia T

List of Research Outputs

Han Q., Xia T., Wang Z. and Li X.G., Impurity state of Nickel in the vortex core of d-wave superconductor, International Journal of Modern Physics B. Singapore, World Scientific, 2003, 17: 3604-3606.

Han Q., Xia T., Wang Z. and Li X.G., Impurity states in d-wave superconductors with a competing antiferromagnetic interaction, Physical Review B. New York, The American Physical Society, 2004, 69: 224512:1-9.

Han Q., Wang Z., Wang Q.H. and Xia T., Vortex state in Na_xCoO₂?yH₂O: p_x±ip_y–wave versus d_x²–y²±id_xy–wave pairing, Physical Review Letters. New York, The American Physical Society, 2004, 92: 027004:1-4.

Researcher : Xie MH

Project Title:	The nature of GaN "Ghost Island" and its effect on growth kinetics
Investigator(s):	Dr. Xie M.H.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2001

Abstract:

To investigate the nature of the "ghost" islands and to study their effects on growth processes of GaN by MBE; to investigate what effect(s) the "ghost island" may have on the growth processes of GaN by MBE.

Project Title:	Growth mode and strain relaxation of InGaN grown on GaN
Investigator(s):	Dr. Xie M.H.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2002

Abstract:

The project aims at studying the growth mode, especially 3-dimensional islanding processes of InGaN grown on GaN by molecular beam epitaxy (MBE). It is designed to explore a wide range of growth parameters and to cover the whole range of In compositions of InGaN. Emphasis will be put on the underlying physics governing the growth mode.

Project Title:	Effect of excess gallium on growth kinetics of GaN
Investigator(s):	Dr. Xie M.H.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2003

Abstract:

To study the effect of excess Ga on island nucleation kinetrics; to study the effect of excess Ga on step morphology and kinetrics.

Project Title:	Effect of excess gallium on growth kinetics of GaN
Investigator(s):	Dr. Xie M.H.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	09/2003

Abstract:

To study the effect of excess Ga on island nucleation kinetrics; to study the effect of excess Ga on step morphology and kinetrics.

List of Research Outputs

Cao Y., Xie M.H., Liu Y., Ng Y.F., Wu H.S. and Tong S.Y., InN island shape and its dependence on growth condition of molecular-beam epitaxy, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 5157-5159.

Cao Y., Xie M.H., Liu Y., Xu S., Ng Y.F., Wu H.S. and Tong S.Y., Scaling of three-dimensional InN islands grown on GaN(0001) by molecular-beam epitaxy, Physical Review B (Rapid Communications). New York, The American Physical Society, 2003, 68: 161304:1-4.

Dai X., Wu H.S., Xu S., Xie M.H. and Tong S.Y., Atomic design of polarity of GaN films grown on SiC(0001), Communications in Theoretical Physics. International Academic Pub., 2004, 41: 609-613.

Dai X., Wu H.S., Xie M.H., Xu S. and Tong S.Y., Nitrogen adatom diffusion on a Ga-rich GaN (0001) surface, Chinese Physics Letters. Chinese Physical Society and IOP Pub., 2004, 21: 527-529.

Dai X., Wu H.S., Xu S., Xie M.H. and Tong S.Y., Structural properties of GaN films grown on the 6H-SiC(0001) (sqrt{3} x sqrt{3}) R30^o substrate, Surface Review and Letters. Singapore, World Scientific, 2004, 11: 1-6.

Leung Y.H., Djurisic A., Gao J., Xie M.H. and Chan W.K., Changing the shape of ZnO nanostructures by controlling Zn vapor release: from tetrapod to bone-like nanorods, Chemical Physics Letters. Amsterdam, Elsevier B.V., 2004, 385: 155-159.

Roy V.A.L., Djurisic A., Liu H., Zhang X.X., Leung Y.H., Xie M.H., Gao J., Lui H.F. and Surya C., Magnetic properties of Mn doped ZnO tetrapod structures, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 756-758.

Xie M.H., Zheng L., Dai X., Wu H.S. and Tong S.Y., A model for GaN ‘ghost’ islands, Surface Science. Amsterdam, Elsevier B.V., 2004, 558: 195-200.

Xu S., Wang H.J., Cheung S.H., Li Q., Dai X., Xie M.H. and Tong D.S.Y., Shallow optically active structural defect in wurtzite GaN epilayers grown on stepped 4H-SiC substrates, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 3477-3479.

Zhao D., Xu S., Xie M.H., Tong D.S.Y. and Yang H., Stress and its effect on optical properties of GaN epilayers grown on Si(111), 6H-SiC(0001), and c-plane sapphire, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 677-679.

Researcher : Xie Z

List of Research Outputs

Xie Z., The study of phase-resolved spectra of gamma-ray pulsars. Hong Kong, The University of Hong Kong, 2003, 1-86.

Researcher : Xu S (Xu Shijie)

Project Title:	Optical properties of individual self-assembled InAs/GaAs Quantum Dots
Investigator(s):	Dr. Xu S.J.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	05/2002

Abstract:

To optically probe individual self-assembled InAs/GaAs quantum dots and understand the nature of their optical properties by using advanced electron-beam lithography and near-field scanning optical microscopy/spectroscopy.

Project Title:	Comprehensive spectroscopy investigations of blue and green InGaN/GaN light-emitting diode structures with multi-quantum-wells
Investigator(s):	Dr. Xu S.J.
Department:	Physics
Source(s) of Funding:	Hong Kong Research Grants Council Competitive Earmarked Research Grants
Start Date:	09/2003

Abstract:

Pending

Project Title:	Comprehensive spectroscopy investigations of blue and green InGaN/GaN light-emitting diode structures with multi-quantum-wells
Investigator(s):	Dr. Xu S.J.
Department:	Physics
Source(s) of Funding:	RGC Projects (Block Grant Funded)
Start Date:	09/2003

Abstract:

Pending

Project Title:	Optical characterization of cubic phase GaN epilayers grown 6H-SiC substrates
Investigator(s):	Dr. Xu S.J., Dr. Wu H.S.
Department:	Physics
Source(s) of Funding:	Block Grant Earmarked for Research
Start Date:	04/2004

Abstract:

To investigate optical properties of the cubic phase GaN grown on 6H-SiC. Optical characterization of the available samples and new samples to be grown is major task of the proposed research.

List of Research Outputs

Roy V.A.L., Djurisic A., Li Q., Xu S., Lui H.F., Surya C. and Gao J., Simple technique for bulk quantity synthesis of ZnO tetrapod nanorods, Proceeding of SPIE. Bellingham, SPIE, 2003, 5219: 51-58.

Su F.H., Fang Z.L., Ma B.S., Ding K., Li G.H. and Xu S., Temperature and pressure behavior of the emission bands from Mn-, Cu-, and Eu-doped ZnS nanocrystals, Journal of Applied Physics. New York, American Institute of Physics, 2004, 95: 3344-3349.

Xu S., Li Q., Dong J.R. and Chua S.J., Interpretation of anomalous temperature dependence of anti-Stokes photoluminescence at GaInP₂/GaAs interface, Applied Physics Letters. New York, American Institute of Physics, 2004, 84: 2280-2282.

Xu S., Wang H.J., Cheung S.H., Li Q., Dai X., Xie M.H. and Tong D.S.Y., Shallow optically active structural defect in wurtzite GaN epilayers grown on stepped 4H-SiC substrates, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 3477-3479.

Zhao D., Xu S., Xie M.H., Tong D.S.Y. and Yang H., Stress and its effect on optical properties of GaN epilayers grown on Si(111), 6H-SiC(0001), and c-plane sapphire, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 677-679.

Researcher : Xu S (Xu Shihong)

List of Research Outputs

Cao Y., Xie M.H., Liu Y., Xu S., Ng Y.F., Wu H.S. and Tong S.Y., Scaling of three-dimensional InN islands grown on GaN(0001) by molecular-beam epitaxy, Physical Review B (Rapid Communications). New York, The American Physical Society, 2003, 68: 161304:1-4.

Dai X., Wu H.S., Xu S., Xie M.H. and Tong S.Y., Atomic design of polarity of GaN films grown on SiC(0001), Communications in Theoretical Physics. International Academic Pub., 2004, 41: 609-613.

Dai X., Wu H.S., Xie M.H., Xu S. and Tong S.Y., Nitrogen adatom diffusion on a Ga-rich GaN (0001) surface, Chinese Physics Letters. Chinese Physical Society and IOP Pub., 2004, 21: 527-529.

Dai X., Wu H.S., Xu S., Xie M.H. and Tong S.Y., Structural properties of GaN films grown on the 6H-SiC(0001) (sqrt{3} x sqrt{3}) R30^o substrate, Surface Review and Letters. Singapore, World Scientific, 2004, 11: 1-6.

Xu S., Wu H.S., Tong S.Y., Keeffe M., Lapeyre G.J. and Rotenberg E., Study of the C₂H₄/Si(100)-(2 x 1) interface by derivative photoelectron holography, Surface Review and Letters. Singapore, World Scientific, 2003, 10: 925-932.

Researcher : Yang K

List of Research Outputs

Yang K., Quantum information processing with quantum dots and Josephson junctions. Hong Kong, The University of Hong Kong, 2003, 1-88.

Yang K., Zhu S. and Wang Z., Universal quantum gates based on both geometric and dynamic phases in quantum dots, Chinese Physics Letters. Chinese Physical Society and IOP Publishing Limited, 2003, 20: 991-994.

Zhu S., Wang Z. and Yang K., Quantum-information processing using Josephson junctions coupled through cavities, Physical Review A. New York, The American Physical Society, 2003, 68: 034303:1-4.

Researcher : Yu TF

List of Research Outputs

Li H., Yu T.F. and Fung P.C.W., The positive magnetic susceptibility for Rb₃C₆₀ superconductor and the differential paramagnetic effect, Journal of Superconductivity. Plenum Pub. Corp., 2004, 17: 369-372.

Researcher : Zhang F

List of Research Outputs

Anderson P.W., Lee P.A., Randeria M., Rice T.M., Trivedi N. and Zhang F., The physics behind high-temperature superconducting cuprates: the ‘plain vanilla’ version of RVB, Journal of Physics: Condensed Matter. Bristol, IOP Publishing Limited, 2004, 16: R755-R769.

Shen S., Ma M., Xie X.C. and Zhang F., Resonant spin Hall conductance in two-dimensional electron systems with a Rashba interaction in a perpendicular magnetic field, Physical Review Letters. New York, The American Physical Society, 2004, 92: 256603:1-4.

Researcher : Zhao D

List of Research Outputs

Zhao D., Xu S., Xie M.H., Tong D.S.Y. and Yang H., Stress and its effect on optical properties of GaN epilayers grown on Si(111), 6H-SiC(0001), and c-plane sapphire, Applied Physics Letters. New York, American Institute of Physics, 2003, 83: 677-679.

Researcher : Zhao HK

List of Research Outputs

Zhao H.K. and Wang J., Coherent mesoscopic transport through a quantum-dot embedded carbon nanotube ring threaded with magnetic flux, Physics Letters A. Amsterdam, Elsevier B.V., 2004, 323: 285-289.

Researcher : Zheng L

List of Research Outputs

Xie M.H., Zheng L., Dai X., Wu H.S. and Tong S.Y., A model for GaN ‘ghost’ islands, Surface Science. Amsterdam, Elsevier B.V., 2004, 558: 195-200.

Researcher : Zhou B

List of Research Outputs

Zhou B., Tao R.B. and Shen S., Quantum-classical transition of the escape rate of uniaxial antiferromagnetic particles in an arbitrarily directed field, Physical Review B. New York, The American Physical Society, 2003, 68: 214423:1-6.

Researcher : Zhu S

List of Research Outputs

He G.P., Zhu S., Wang Z. and Li H.Z., Testing Bell's inequality and measuring the entanglement using superconducting nanocircuits, Physical Review A. New York, The American Physical Society, 2003, 68: 012315:1-6.

Yang K., Zhu S. and Wang Z., Universal quantum gates based on both geometric and dynamic phases in quantum dots, Chinese Physics Letters. Chinese Physical Society and IOP Publishing Limited, 2003, 20: 991-994.

Zhu S., Wang Z. and Yang K., Quantum-information processing using Josephson junctions coupled through cavities, Physical Review A. New York, The American Physical Society, 2003, 68: 034303:1-4.

Zhu S. and Wang Z., Unconventional geometric quantum computation, Physical Review Letters. New York, The American Physical Society, 2003, 91: 187902:1-4.

Researcher : Zhu S

List of Research Outputs

Zhu S., Wang Z. and Yang K., Quantum-information processing using Josephson junctions coupled through cavities, Physical Review A. New York, The American Physical Society, 2003, 68: 034303:1-4.

Zhu S. and Wang Z., Unconventional geometric quantum computation, Physical Review Letters. New York, The American Physical Society, 2003, 91: 187902:1-4.

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