题目：非厄米趋肤效应和广义布里渊区理论

报告人：杨哲森 教授

时 间：2024.03.21 (周四) 下午2：30

地 点：良乡校区，物理实验中心229会议室

摘要：

非厄米趋肤效应是近两年来理论和实验的研究热点之一，它是指在一个无杂质、无相互作用的开边界系统中，本征波函数可以都局域在边界的一类新奇现象。非厄米趋肤效应的出现意味着传统布洛赫定理及能带理论的失效。为了定量的刻画非厄米趋肤效应，人们发展了广义布里渊区理论。在本次报告中，我将会介绍：

(1)什么是非厄米趋肤效应；

(2)什么是广义布理渊区理论；

(3)如何在凝聚态系统中实现以及探测非厄米趋肤效应；

(4)二维广义布里渊区理论及其挑战；

参考文献：

[1] Kai Zhang*, Zhesen Yang*, and Chen Fang†, Phys. Rev. Lett. 125, 126402 (2020).

[2] Zhesen Yang*, Kai Zhang*, Chen Fang†, and Jiangping Hu†, Phys. Rev. Lett. 125, 226402 (2020).

[3] Kai Zhang, Zhesen Yang†, and Chen Fang†, Nat Commun 13, 2496 (2022).

[4] Yifei Yi, and Zhesen Yang†, Phys. Rev. Lett. 125, 186802 (2020).

[5] Kai Zhang, Chen Fang†, and Zhesen Yang†, Phys. Rev. Lett. 131, 036402 (2023).

[6] Zeqi Xu, Bo Pang, Kai Zhang† and Zhesen Yang†, arXiv:2311.16868

简历：

杨哲森，厦门大学物理科学与技术学院教授。2020年毕业于中国科学院物理研究所，随后在中国科学院卡弗里理论科学研究所从事博士后研究工作。曾获2021年博士后创新人才计划和基金委优秀青年基金的支持，主要研究兴趣集中在非厄米系统的新奇物理现象，特别是非厄米趋肤效应。

联系方式：qinshengshan@bit.edu.cn

邀请人： 秦盛山

网 址：http://physics.bit.edu.cn/

承办单位：物理学院、先进光电量子结构设计与测量教育部重点实验室

*Title：Non-Hermitian Skin Effect and Generalized Brillouin Zone Theory

*Reporter：Prof. Zhesen Yang

*Time：2024.03.21 (Thursday) 2：30 pm

*Place：Room 229 Physics Experiment Center, Liangxiang Campus

*Contact Person: Shengshan Qin

*Abstract: The non-Hermitian skin effect has emerged as a prominent topic of theoretical and experimental research in recent years. It refers to a fascinating phenomenon where the eigenstate wave functions can be localized near the boundaries in an open system. The appearance of the non-Hermitian skin effect signifies the breakdown of traditional Bloch’s theorem and band theory. To quantitatively characterize this effect, researchers have developed the Generalized Brillouin Zone Theory. In this presentation, I will cover the following points:

1. What is the non-Hermitian skin effect?

2. Introduction to the Generalized Brillouin Zone Theory.

3. Methods for realizing and detecting the non-Hermitian skin effect in condensed matter systems.

4. Challenges related to two-dimensional Generalized Brillouin Zone Theory.

Refereces:

[1] Kai Zhang*, Zhesen Yang*, and Chen Fang†, Phys. Rev. Lett. 125, 126402 (2020).

[2] Zhesen Yang*, Kai Zhang*, Chen Fang†, and Jiangping Hu†, Phys. Rev. Lett. 125, 226402 (2020).

[3] Kai Zhang, Zhesen Yang†, and Chen Fang†, Nat Commun 13, 2496 (2022).

[4] Yifei Yi, and Zhesen Yang†, Phys. Rev. Lett. 125, 186802 (2020).

[5] Kai Zhang, Chen Fang†, and Zhesen Yang†, Phys. Rev. Lett. 131, 036402 (2023).

[6] Zeqi Xu, Bo Pang, Kai Zhang† and Zhesen Yang†, arXiv:2311.16868

*Profile：Zhesen Yang is a professor at the School of Physical Science and Technology, Xiamen University. He graduated from the Institute of Physics, Chinese Academy of Sciences, in 2020 and subsequently conducted postdoctoral research at the Kavli Institute for Theoretical Sciences, Chinese Academy of Sciences. He has received support from the 2021 Postdoctoral Innovation Talent Program and the National Natural Science Foundation of China for Outstanding Young Scholars. His primary research interests lie in novel physical phenomena in non-Hermitian systems, particularly the non-Hermitian skin effect.