报告题目：拓扑态的材料设计

主讲嘉宾：余睿教授

邀请人：李武研究员

时间：2018年12月25日周二10:00

地点：办公楼103  

报告摘要：

The Dirac, Weyl and Nodal-line states have attracted great research interest in condensed matter physics and material science. In this talk, I will introduce two works on topological semimetals. (1) Based on first-principles calculations and symmetry analysis, we report that Ag2S with P212121 symmetry is a topological Dirac semimetal in the absence of spin-orbit coupling (SOC). Every Dirac points are composed of two Weyl points with the same chirality overlapping 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 on material surface. (2) We introduce a scheme to realize topological nodal states with a three-dimensional periodic inductor-capacitor (LC) circuit lattice, where the topological nodal line state and Weyl state can be achieved by tuning the parameters of inductors and capacitors. The key characters of the topological states, such as the drumhead-like surface bands for nodal line state and the Fermi arc-like surface bands for Weyl state, are found in these systems.    

嘉宾简介：

余睿，武汉大学物理科学与技术学院教授。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。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。