【学术报告】Non-Hermitian Topological Systems
发布时间:2022-11-03   浏览次数:0

主 讲 人 :金亮    教授


地  点:腾讯会议:774 329 883


The way of non-Hermiticity appearance matters for the system topology. In this talk, we review our recentprogresses in non-Hermitian topological phases. We first show the breakdown of conventional bulk-boundary correspondence and explainit from the aviewpoint of non-HermitianAharonov-Bohm effect. We show that the inversion symmetry andcombined-inversion symmetry play an important role for the validity of conventional bulk-boundary correspondence. Then, we will talk about that the topological phase transition,the topological invariant, and the existence of edge states may not be altered, being independent of the non-Hermitian phase transition, if the non-Hermiticityis properly introduced. Finally; we will show a graphic approach proposedfor the visualization of topological phases. The rich topological phases of eitherHermitian or non-Hermitian band touching, and either trivial or nontrivialphases are distinguishable from the eigenstate graphs.