ProfessorXIE, Maohai

Professor, Department of Physics, Faculty of Science, HKU

B.Eng. Tianjin; M.Sc. Chinese Acad of Sc; Ph.D. Lond; DIC

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[javascript protected email address]
2859 7945
2559 9152
Room 415C, CYM Physics Building, The University of Hong Kong, Pokfulam Road, Hong Kong

Current Research

Experimental Condensed Matter and Material Science Group: Materials Science -Experimental Surface ScienceThe surface science laboratory aims at understanding the processes and properties that occur at the boundary of materials - surface.
Current researches focus on the growth and surface characterizations of low-dimensional materials, such as transition-metal dichalcogenides and their hetero-structures.
We carry out molecular beam epitaxy (MBE) and surface studies of ultrathin layers MBE is one of the most versatile techniques to grow materials with precise control. It allows fabrication of artificial structures by combining different materials to form the so-called "quantum wells" and "superlattices". Quantum effects and new concepts in material sciences are thus explored for modern device applications. By using STM/S and UPS, we characterize the atomic and electronic structures of film surfaces. The latter are important for the understanding various quantum effects at atomic scale.

Research Interest

Experimental Condensed Matter Physics
Surface and Materials Science
Molecular-beam Epitaxy
Scanning Tunneling Microscopy
Electron Diffraction
Photoelectron Spectroscopy

Representative Publications

"One-dimensional phosphorus chain and two-dimensional blue phosphorene grown on Au (111) by molecular-beam epitaxy", J.P. Xu, J.Q. Zhang, H. Tian, H. Xu, W.K. Ho,M.H. Xie.Phys. Rev. Mater.,1, 061002(R)(2017)
"Inversion Domain Boundary Induced Stacking and Bandstructure Diversity in Bilayer MoSe2", J.H. Hong, C. Wang, H.J. Liu, X.B. Ren, J.L. Chen, G. Wang, J.F. Jia,M.H. Xie, C.H. Jin, W. Ji, J. Yuan, Z. Zhang,Nano Letter,17, 11, 6653-6660 (2017)
"Quantum effects and phase tuning in epitaxial hexagonal and monoclinic MoTe2 monolayers”, J. Chen, G.Y. Wang, Y.A. Tang, H. Tian, J. Xu, X.Q. Dai, H. Xu, J.F. Jia, W.K. Ho,M.H. Xie,ACS Nano,11, 3282 (2017)
“Observation of intervalley quantum interference in epitaxial monolayer tungsten diselenide”, H.J. Liu, J.L. Chen, H.Y. Yu, F. Yang, L. Jiao, G.B. Liu, W.K. Ho, C.L. Gao, J.F. Jia, W. Yao,M.H. Xie,Nat. Comm.,6, 8180 (2015)
“Line and point defects in MoSe₂bilayer studied by scanning tunneling microscopy and spectroscopy”, H.J. Liu, H. Zheng, F. Yang, L. Jiao, J.L. Chen, W.K. Ho, C.L. Gao, J.F. Jia,M.H. Xie,ACS Nano.,9, 6619 (2015)
“Molecular-beam epitaxy of monolayer and bilayer WSe₂: a scanning tunneling microscopy / spectroscopy study and deduction of exciton binding energy”, H.J. Liu, L. Jiao, L. Xie, F. Yang, J.L. Chen, W.K. Ho, C.L. Gao, J.F. Jia, X.D. Cui,M.H. Xie,2DMater.,2, 034004 (2015)
“Dense network of one-dimensional midgap metallic modes in monolayer MoSe₂and their spatial undulations”, H.J. Liu, L. Jiao, F. Yang, Y. Cai, X. Wu, W.K. Ho, C.L. Gao, J.F. Jia, N. Wang, H. Fan, W. Yao,M.H. Xie,Phys. Rev. Lett.,113, 066105 (2014)
“Anisotropic topological surface states on high-index Bi₂Se₃films”, Z.J. Xu, X. Guo, M.Y. Yao, H.T. He, L. Miao, L. Jiao, H.C. Liu, J.N. Wang, D. Qian, J.F. Jia, W.K. Ho,M.H. Xie,Adv. Mater.,25, 1557 (2013)