【大学频道】中国科学院大学卡弗里理论科学研究所呈献 | 清华大学徐勇

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图 | 徐勇

题   目：Scheme to Equilibrate the Hall Response of Topological Systems from Coherent Dynamics

报告人：徐勇

单   位：清华大学

时   间：2019-06-05

地   点：中国科学院大学

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报告摘要

Abstract: Two-dimensional topologically distinct Chern insulators are separated by gap closing points, which exist as Weyl points in three-dimensional momentum space. Slowly varying parameters in the two-dimensional Hamiltonian across two distinct phases therefore necessarily experiences the gap closing process, which prevents the intrinsic physical observable, the Hall response, from equilibrating. In this talk, I will introduce a new scheme to equilibrate the quantized Hall response from pure coherent dynamics as the Hamiltonian is slowly tuned from the topologically trivial to nontrivial regimes. This method is further applied to Weyl semimetals in three dimensions and find the equilibrated Hall response despite the underlying gapless band structure.

个人简介

Yong Xu received his B.S. degree from Lanzhou University in 2005 and PhD degree from Institute of Physics, Chinese Academy of Science in 2013. In 2017, he joined the Institute for Interdisciplinary Information Sciences at Tsinghua University as an assistant professor, after his postdoc training at the University of Michigan, Ann Arbor. His research interests broadly encompass the theory of topological condensed matter physics and ultra-cold atomic gases. His mainly research contribution includes the theoretical prediction of structured (type-II) Weyl fermions, Weyl exceptional rings, type-II quadrupole topological insulators and new topological insulators beyond energy band characterization.

—— ——往期精彩回顾—— ——●【学术视频】第十三届冷原子物理青年学者学术讨论会 | 清华大学徐勇助理教授：Scheme to Equilibrate the Hall Response of Topological Systems from Coherent Dynamics●【大学频道】中国科学院大学卡弗里理论科学研究所呈献 | 山东大学刘文剑教授：Advances in TD-DFT●【大学频道】中国科学院大学卡弗里理论科学研究所呈献 | 北京大学李新征副教授：The quantum nature of nuclei and its influence●【大学频道】中国科学院大学卡弗里理论科学研究所呈献 | 中国科大陈宇翱教授：

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