题目：拓扑半金属态的材料设计

报告人：余睿 教授，武汉大学 物理科学与技术学院

地点：理科群二号楼B409

时间：11月20日上午10：00-11:00，星期二

摘要：

The Dirac, Weyl and Nodal-line states have attracted great researchinterest in condensed matter physics and material science. In this talk, I willintroduce two works on topological semimetals. (1) Based on first-principlescalculations and symmetry analysis, we report that Ag2S with P212121 symmetryis a topological Dirac semimetal in the absence of spin-orbit coupling (SOC).Every Dirac points are composed of two Weyl points with the same chiralityoverlapping in the momentum space. After taking the SOC into consideration,each Dirac point is split into two Weyl points and lead to long Fermi-arcs onmaterial surface. (2) We introduce a scheme to realize topological nodal stateswith a three-dimensional periodic inductor-capacitor (LC) circuit lattice,where the topological nodal line state and Weyl state can be achieved by tuningthe parameters of inductors and capacitors. The key characters of the topologicalstates, such as the drumhead-like surface bands for nodal line state and theFermi arc-like surface bands for Weyl state, are found in these systems.

报告人简介：

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，获得过2012年中国科学院百篇优博。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.