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Jones polynomial and knot transitions in Hermitian and non-Hermitian topological semimetals
来源: 日期2022-07-01 17:25 点击:

报告时间:202175日(周一)上午10:30 - 11:30

报告地点:仲英楼B243

报告人:杨哲森(中国科bob-博鱼综合app下载 bob-博鱼综合app下载 卡弗里理论bob-博鱼综合app下载 所)

报告摘要:

Topological nodal line semimetals can host stable chained, linked, or knotted line degeneracies in momentum space protected by symmetries. In this talk, I will show how to use the Jones polynomial (which is a knot invariant) to classify these semimetals. I will also show that every possible change in Jones polynomial is attributed to the local evolutions around every point where two nodal lines touch. As an application of our theory, I will illustrate that nodal chain semimetals with four touching points can evolve to a Hopf link. Finally, I will extend our theory to 3D non-Hermitian exceptional line semimetals.

Reference: Phys. Rev. Lett. 124, 186402 (2020)(Editors’ Suggestion)

报告人简介:杨哲森,2020年在中科院物理所获得博士学位,现于中国科bob-博鱼综合app下载 bob-博鱼综合app下载 卡弗里理论bob-博鱼综合app下载 所从事博士后研究。主要研究方向是非厄米量子系统的新奇物理性质和拓扑能带理论。目前发表论文十余篇,其中包括6篇PRL。

邀请人:朱小宇

 

 
 
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责任编辑:刘钰哲
 
 
 
 
 
 
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