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浙师大物理学科云端学术直播活动 (十九) :A new way to construct topological invariants of non-Hermitian systems with the non-Hermitian skin effect (刘承师 教授,燕山大学)
发布时间: 2020-05-20 浏览次数: 93

【报告题目】A new way to construct topological invariants of non-Hermitian systems with the non-Hermitian skin effect

【报告人】刘承师 教授,燕山大学

【时间】 20200527下午14:00

学术活动直播地址:https://meeting.tencent.com/s/TD3IwkF93KpA,会议ID: 164364716,密码: 29313

报告简介The non-Hermitian skin effect breaks the conventional bulk–boundary correspondence and leads to non-Bloch topological invariants. Inspired by the fact that the topological protected zero modes are immune to perturbations, we construct a partner of a non-Hermitian system by getting rid of the non-Hermitian skin effect. Through adjusting the imbalance hopping, we find that the existence of zero-energy boundary states still dictate the bulk topological invariants based on the band-theory framework. Two non-Hermitian Su–Schrieffer–Heeger (SSH) models are used to illuminate the ideas. Specially, we obtain the winding numbers in analytical form without the introduction of the generalized Brillouin zone. The work gives an alternative method to calculate the topological invariants of non-Hermitian systems.

ReferencesA new way to construct topological invariants of non-Hermitian systems with the non-Hermitianskin effect, J S Liu, Y Z Han, C S Liu,Chin. Phys. B 2020, 29(1): 010302.

报告人简介刘承师, 燕山大学应用物理系教授,2003北京师范大学博士;2003-2005在中科院理论物理所从事博士后研究, 2005-2007台湾师范大学合作研究。主要从事研究领域是凝聚态物理,主要研究方向是应用理论和数值方法探讨新出现的量子现象。其中包括:强关联电子系统、玻色爱因斯坦凝聚、高温超导、拓扑量子态。

邀请人】梁兆新,教授