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四川大学物理学学科发展论坛(17)

来源:本站 作者: 发布时间:2018-11-21

 

特邀报告专家:余睿教授 (武汉大学)

报告时间:2018年11月29日 (周四)上午 10:00-11:30

报告地点:物理馆323报告厅

题目: 拓扑半金属态的材料设计

 

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.

 

报告人学术背景及科研方向简介:

余睿,武汉大学物理科学与技术学院教授,主要从事材料的第一性原理计算和理论研究。其本科毕业于华中科技大学,2011年博士毕业于中国科学院物理研究所,并获中科院百篇优秀博士论文奖。2011-2015年在香港大学和日本物质材料研究所(NIMS)从事博士后研究工作。主要研究领域是凝聚态物理中的拓扑物质态,新型功能材料等。已在国际学术期刊上发表论文20篇,总引用3000多次。

   

    欢迎各位老师和同学们光临!

                四川大学物理科学与技术学院

              2018年11月21日