拓扑半金属态的材料设计

主 讲 人 ：余睿     教授

活动时间：11月20日10时00分    

地      点 ：理科群二号楼B409

讲座内容：

The Dirac, Weyl and Nodal-linestates have attracted great research interest in condensed matter physics andmaterial science. In this talk, I will introduce two works on topologicalsemimetals. (1) Based on first-principles calculations and symmetry analysis,we report that Ag2S with P212121 symmetry is a topological Dirac semimetal inthe absence of spin-orbit coupling (SOC). Every Dirac points are composed oftwo Weyl points with the same chirality overlapping in the momentum space.After taking the SOC into consideration, each Dirac point is split into twoWeyl points and lead to long Fermi-arcs on material surface. (2) We introduce ascheme to realize topological nodal states with a three-dimensional periodicinductor-capacitor (LC) circuit lattice, where the topological nodal line stateand Weyl state can be achieved by tuning the parameters of inductors andcapacitors. The key characters of the topological states, such as thedrumhead-like surface bands for nodal line state and the Fermi arc-like surfacebands for Weyl state, are found in these systems.

主讲人介绍：

余睿， 2011年获中国科学院物理研究所博士学位，2011-2015年在香港和日本做博士后研究，现在武汉大学物理科学与技术学院工作。主要从事材料的第一性原理计算和理论研究。研究兴趣包括：拓扑物质态，新型功能材料等，已发表学术论文20篇，总引用3000多次.

发布时间：2018-11-19 14:51:52