| 报告题目： |
Topological Quantum Materials and Others |
| 报告人： |
Shun-Qing Shen |
| 报告人单位： |
Department of Physics, The University of Hong Kong |
| 报告时间： |
9月14日下午16：10 |
| 报告地点： |
科技楼北410 |
| 报告摘要： |
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Topology is an old branch of mathematics, and is now becoming an efficient to discover new phases of matter. In the last decade, prediction and discovery of topological insulators and other materials is the most significant progress in condensed matter physics and material sciences on topological matericals. Topological insulator is an insulator that always has a metallic boundary. These metallic boundaries originate from the topology of the band structure of solids, which is insensitive to the geometry of system and cannot change as long as the material remains insulating. The first topological state of matter is the quantum Hall state, the Hall conductance of which is insensitive to continuous changes in the parameters and depends only on the number of edge states, which are unidirectional because of the breaking of the time reversal symmetry due to the magnetic field. This effect was generalized to the system with time reversal symmetry, such as graphene with spin orbit coupling and an "inverted" semiconductor HgTe/CdTe quantum well, exhibiting the phenomenon of the quantum spin Hall effect. The new state has been generalized from two dimensions to three dimensions and one dimension, from insulator to superconductors, semimetals and other systems such as photonic crystals, metamaterials and even classical mechanics.
In this talk I first present an introduction to topological phases of matter and recent progresses especially on topological superconductors and topological Weyl semimetal. A simple but unified description for a large family of topological phases of matter based is presented based on a modified Dirac equation. |
| 报告人简介： |
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Professor Shun-Qing Shen, an expert in the field of condensed matter physics, is distinguished for his research works on topological insulator, quantum transport theory, spintronics of semiconductors, quantum magnetism and orbital physics in transition metal oxides, and novel quantum states of condensed matters, and strong correlated electron systems. He has published a single-authored monograph, Topological Insulators (Springer, 2012), which is the first book on the topic. He was awarded Croucher Senior Research Fellowship (The Croucher Award) in 2010.
Professor Shen has been a professor of physics at The University of Hong Kong since July 2007. Professor Shen received his BS, MS, and PhD in theoretical physics from Fudan University in Shanghai. He was a postdoctorial fellow (1992 – 1995) in China Center of Advanced Science and Technology (CCAST), Beijing, Alexander von Humboldt fellow (1995 – 1997) in Max Planck Institute for Physics of Complex Systems, Dresden, Germany, and JSPS research fellow (1997) in Tokyo Institute of Technology, Japan. In December 1997 he joined Department of Physics, The University of Hong Kong. |
