【报告题目】：Non-Hermitian Thouless Pumping: Interplay between Topological Charge Pumping and Directional Tunneling
【报告时间】：2025年06月06日 14:30-15:30
【报告人】：张仁教授，西安交通大学
【报告地点】：腾讯会议：684791010
【报告摘要】：Motivated by experimental realizations of the lattice models with directional tunneling and the generalized bulk-edge correspondence brought by similarity transformation, we study the topological charge pumping using the Rice-Mele (RM) model with directional tunneling (also termed as the non-Hermitian RM model). In the momentum space, through a similarity-like transformation, we map the non-Hermitian RM model to a Hermitian one. Under the biorthogonal basis, the pumping is dictated by a Chern number of the Hermitian RM model. This can be verified by experiments where both the non-Hermitian RM model and its Hermitian conjugation are realized. Under the right-right vector basis, which is relevant to experiments where only the non-Hermitian one is required, we find that the charge pumping contains a dynamical and a topological part. To reveal the topological contribution, an experimental scheme of canceling the dynamical term is proposed.
【报告人简介】：张仁，西安交通大学物理学院教授，博士生导师，仲英青年学者。2008年本科毕业于河南师范大学，2014年毕业于中国人民大学并获得博士学位。2014--2017年在清华大学高等研究院从事博士后研究。2017年加入西安交通大学至今。研究兴趣包括冷原子物理，非厄米物理，量子动力学理论以及弯曲空间中的量子物理等。目前，已在包括Nature Physics，Nature Reviews Physics, PRL，Science Bulletin等学术杂志发表论文40余篇。
