ProfessorXU, Shijie

Professor, Department of Physics, Faculty of Science, HKU

B.S. Hebei UT; M.S., Ph.D. Xian Jiaotong, Senior MOSA

WEBSITE

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[javascript protected email address]
2241 5636
2559 9152
Room 316, CYM Physics Building, The University of Hong Kong, Pokfulam Road, Hong Kong

Current Research

Experimental Condensed Matter and Material Science Group:Experimental Condensed Matter -Novel Optical Properties of Semiconductor NanostructuresOptical properties including nonlinear optical properties, electronic structures, electron-phonon interactions, ultrafast phenomena, phonon and defect states in new semiconductor nanostructures such as self-assembled quantum dots, nanocrystals and new two-dimensional transition metal dichalcogenides are our current research interests. In addition, optoelectronic device applications of the semiconductor nanostructures are also our research interest. The materials being investigated by us include III-nitrides, SiC, traditional III-V and II-VI compound semiconductors as well as new 2D transition metal dichalcogenides. The laboratory has been already equipped by variable-temperature (4.2 K-300 K) photoluminescence system, scanning confocal micro-Raman image/spectroscopy system, variable-temperature (10 K-330 K) broadband (200 nm-1700 nm) emission/absorption/reflection spectroscopy, pump-probe based ultrafast (sub-ps) and gated integrator + boxcar averager based (20 ns to ms) time-resolved photoluminescence system, and newly-established low-temperature magneto-photoluminescence spectroscopy with super high spectral resolution. Currently, a pump-probe based fs laser source + scanning confocal microscopy system is being implemented by us, which enables us optically investigate ultrafast quantum processes and even imagine such processes occurring in individual semiconductor nanostructures.
Further information of the group can be found at here.

Research Interest

Optical properties including nonlinear optical properties and ultrafast phenomena of semiconductor nanostructures. Luminescence and imaging of individual quantum dots are also our interest.

Representative Publications

“Luminescence and thermal behaviors of free and trapped excitons in cesium lead halide perovskite nanosheets”, Xiangzhou Lao, Zhi Yang, Zhicheng Su, Zilan Wang, Honggang Ye, Minqiang Wang, Xi Yao, andShijie Xu,Nanoscale10, 9949 (2018)
“Effective Photon Recycling and Super Long Lived Minority Carriers in GaInP/GaAs Heterostructure Solar Cell: A Time-Resolved Optical Study”, Z. C. Su,Shijie Xu, X. H. Wang, J. Q. Ning, Rongxin Wang, Shulong Lu, Jianrong Dong, and Hui Yang,IEEE Journal of Photovoltaics8, 820 (2018)
“Understanding and manipulating luminescence in carbon nanodots”, Z. C. Su, H. G. Ye, Z. Xiong, Q. Lou, Z. Zhang, F. Tang, J. Y. Tang, J. Y. Dai, C. X. Shan, and S. J. Xu, Carbon126, 58 (2018)
“Luminescence Anisotropy and Thermal Effect of Magnetic and Electric Dipole Transitions of Cr3+ Ions in Yb: YAG Transparent Ceramic”, Fei Tang, Honggang Ye, Zhicheng Su, Yitian Bao, Wang Guo, andShijie Xu,ACS Applied Materials & Interfaces9, 43790 (2017)
“Extinction of the zero-phonon line and the first-order phonon sideband in excitonic luminescence of ZnO at room temperature: the self-absorption effect”, Honggang Ye, Zhicheng Su, Fei Tang, Changcheng Zheng, Guangde Chen, Jian Wang, andShijie Xu,Science Bulletin62, 1525 (2017)
“Electroluminescence Probe of Internal Processes of Carriers in GaInP Single Junction Solar Cell”, Z.C. Su,S.J. Xu, R.X. Wang, J.Q. Ning, J.R. Dong, S.L. Lu, and H. Yang,Solar Energy Materials and Solar Cells168, 201 (2017).
“A generalized model for time-resolved luminescence of localized carriers and applications: Dispersive thermodynamics of localized carriers”, Zhicheng Su andShijie Xu,Scientific Reports7, 13 (2017)
“Triplet harvesting in luminescent Cu(I) complexes by thermally activated luminescence mechanism transition: Impact of molecular structure”, Z.C. Su, C.C. Zheng, G. Cheng, C.-M. Che, andS.J. Xu,Journal of Materials ChemistryC,5, 4488 (2017)
“Excitation Dependent Phosphorous Property and New Model of the Structured Green Luminescence in ZnO”, Honggang Ye, Zhicheng Su, Fei Tang, Mingzheng Wang, Guangde Chen, Jian Wang, andShijie Xu,Scientific Reports7, 41460 (2017)
“Carrier Localization Effects in InGaN/GaN Multiple-Quantum-Wells LED Nanowires: Luminescence Quantum Efficiency Improvement and “Negative” Thermal Activation Energy”,Wei Bao, Zhicheng Su, Changcheng Zheng, Jiqiang Ning, andShijie Xu,Scientific Reports6, 34545 (2016)
“A set of manganese ions activated fluoride phosphors (A2BF6:Mn4+, A=K, Na, B=Si, Ge, Ti): Synthesis below 0 oC and efficient room-temperature photoluminescence”, F. Tang, Z.C. Su, H.G. Ye, M.Z. Wang, X. Lan, D.L. Philips, Y.G. Cao, andS.J. Xu,Journal of Materials ChemistryC,4, 9561 (2016)
“Transition of radiative recombination channels from delocalized states to localized states in a GaInP alloy with partial atomic ordering: a direct optical signature of Mott transition?”, Z. C. Su, J. Q. Ning, Z. Deng, X. H. Wang,S. J. Xu, R. X. Wang, S. L. Lu, J. R. Dong, and H. Yang,Nanoscale,8, 7113-7118 (2016)
For details, please refer to theHomepageof Laser Spectroscopy Lab.