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LIU Junwei 劉軍偉
PhD, Tsinghua University
Assistant Professor
FULL CV | Personal Home Page
Tel 2358 7971
Email liuj
Office Room 4440
I obtained my BS from Xi'an Jiaotong University in 2009 and PhD from Tsinghua University in 2014. I went to MIT to do the postdoctoral research work for three years. Then I joined the Department of Physics in HKUST in 2017.
 
I have a very broad interest in condensed matter physics, from the traditional phenomena like ferroelectricity to the exotic topological phases like quantum spin Hall insulators. Currently, my research focuses on two parts: 1) the novel topological phases of matter, especially on symmetry-related topological phases, and their material realizations and experimental signatures; 2) applications of advanced machine learning techniques in physics, especially the combination of machine learning techniques and quantum Monte Carlo simulations.
 
In my previous works, by combining various theoretical calculations and analysis with my collaborators, we predicted monolayer WTe2 type of two-dimensional transition metal dichalcogenides to be quantum spin Hall insulator and bulk PbxSn1-x(Se,Te) to be three-dimensional (3D) TCIs. Both predictions have been confirmed by several independent experimental groups. Also, collaborating with experimental group, we discovered the thinnest ferroelectric material in SnTe thin films, and proposed a new type of non-volatile random-access memory device and have filed a patent for the device. In order to further study those novel topological phenomena in strongly correlated systems, we recently developed a new numerical method, dubbed self-learning Monte Carlo (SLMC), by combining machine learning techniques and Monte Carlo simulations. SLMC can be more that 1000 faster than traditional MC methods, and is very powerful to study strongly-correlated systems of large size.
Research Areas
  • Theoritical condensed matter physics, with topics including topological materials including quantum anomalous Hall insulators, topological insulators, topological crystalline insulators and topological semi-metals
  • Quantum Monte Carlo simulations of strongly correlated systems
  • Atomic-layer-thin ferroelectric materials and physics
  • Two-dimensional quantum materials and phenomena; Applications of machine learning techniques in physics
Representative Publications
  • Junwei Liu, Huitao Shen, Yang Qi, Zi Yang Meng, and Liang Fu. Self-learning Monte Carlo method and umulative update in fermion systems, Phys. Rev. B 95, 241104(R) (2017).
 
  • Junwei Liu, Hua Wang, Chen Fang, Liang Fu, and Xiaofeng Qian. Van der Waals stacking induced topological phase transition in layered ternary transition metal chalcogenides, Nano Lett. 17, 467-475 (2017).
 
  • Junwei Liu#, Yang Qi, Zi Yang Meng, and Liang Fu#. Self-learning Monte Carlo method, Phys. Rev. B 95, 041101(R) (2017) (#corresponding author).
 
  • Kai Chang*, Junwei Liu*, Haicheng Lin, Na Wang, Kun Zhao, Anmin Zhang, Feng Jin, Yong Zhong, Xiaopeng Hu, Wenhui Duan, Qingming Zhang, Liang Fu, Qi-Kun Xue, Xi Chen, and Shuai-Hua Ji. Discovery of robust in-plane ferroelectricity in atomic-thick SnTe, Science 353, 274-278 (2016) (*equal contribution).
 
  • Junwei Liu#, Xiaofeng Qian#, and Liang Fu#. Crystal field effect induced topological crystalline insulators in monolayer IV−VI semiconductors, Nano Lett. 15, 2657 (2015) (#corresponding author) .
 
  • Chenhui Yan*, Junwei Liu*, Yunyi Zang, Jianfeng Wang, Zhenyu Wang, Peng Wang, Zhi-Dong Zhang, Lili Wang, Xucun Ma, Shuaihua Ji, Ke He, Liang Fu, Wenhui Duan, Qi-Kun Xue, and Xi Chen. Experimental observation of Dirac-like surface states and topological phase transition in Pb1-xSnxTe(111), Phys. Rev. Lett. 112, 186801 (2014) (*equal contribution).
 
  • Timothy H Hsieh#, Junwei Liu#, and Liang Fu#. Topological crystalline insulators and Dirac octets in antiperovskites, Phys. Rev. B 90, 081112(R) (2014) (#corresponding author) (Editor’s Suggestion).
 
  • Xiaofeng Qian*, Junwei Liu*, Liang Fu, and Ju Li. Quantum spin Hall effect in two-dimensional transition metal dichalcogenides, Science 346, 1344-1347 (2014) (*equal contribution).
 
  • Junwei Liu, Timothy H. Hsieh, Peng Wei, Wenhui Duan, Jagadeesh Moodera, and Liang Fu. Spin-filtered edge states with an electrically tunable gap in a two-dimensional topological crystalline insulator, Nat. Mater. 13, 178-193 (2014).
 
  • Junwei Liu, Wenhui Duan, and Liang Fu. Two types of surface states in topological crystalline insulators, Phys. Rev. B 88, 241303(R) (2013).
Full Publicaiton List [HKUST Scholarly Publications]
DEPARTMENT OF PHYSICS