[CUSPEA学者系列讲座] [谢心澄(北京大学)] 3D quantum Hall effect in topological semimetals


Xin-Cheng Xie (谢心澄), Peking University

November 1, Monday, 15:00-16:30 

Zoom会议号: 930 130 2021    密码: 202111


We investigate the 3D quantum Hall effect in Weyl semimetals and elucidate a global picture of the edge states. The edge states hosting 3D quantum Hall effect are combinations of Fermi arcs and chiral Landau bands dispersing along the magnetic field direction. The Hall conductance shows quantized plateaus with the variance of the magnetic field when the Fermi level is at the Weyl node. However, the chiral Landau bands can change the spatial distribution of the edge states, especially under a tilted magnetic field, and the resulting edge states lead to distinctive Hall transport phenomena. Our work uncovers the novel edge-state nature of the 3D quantum Hall effect in Weyl semimetals. 

About the speaker

Professor Xin-Cheng Xie obtained his B.Sc. in Physics from the University of Science and Technology of China in 1982 and Ph.D. from the University of Maryland in 1988. He became a faculty member in Department of Physics at Oklahoma State University in USA in 1991 and was named Regents Professor in 2004. He worked as Chief Scientist and Director of Laboratory of Condensed Matter Theory and Computation at the Institute of Physics, Chinese Academy of Sciences from 2005 to 2010. Professor Xie joined Peking University in 2010 as Chair Professor and Founding Director of International Center for Quantum Materials. In 2011 he was appointed as the Dean of School of Physics at Peking University. Professor Xie assumed the role of Divisional Director of Mathematical and Physical Sciences, National Natural Science Foundation of China (NSFC) in 2016, and Vice President of NSFC in 2018. 

Professor Xie’s main research interests include quantum Hall effect, quantum transport, topological matter and strongly correlated electron systems. He is an editorial board member of several international peer-reviewed journals, such as the Editor-in-Chief of Science China Physics, Mechanics & Astronomy. He also serves on the international advisory committees of many international conferences and institutes. Professor Xie was elected as a Fellow of American Physical Society in 2008, a Member of Chinese Academy of Sciences in 2015 and a Fellow of The World Academy of Sciences in 2018.