标题: Anomalous dynamics and associated phenomena in topological systems out of equilibrium

报告人：孙孝奇 University of Illinois at Urbana-Champaign

报告时间：2023年2月8日（周三）上午9：00-10：30

腾讯会议ID: 653-214-168

摘要：In 1981, Nielsen and Ninomiya proved that chiral modes cannot emerge from a static lattice system without partners of opposite chirality. Even though the theorem was originally proved in the context of simulating weak interactions on a lattice, it is far more general and has profound implications across a broad range of problems. I will argue that non-equilibrium setup is necessary to circumvent the theorem and generate new topological phenomena in local lattice systems. Especially, I will discuss schemes to realize anomalous chiral dynamics and highlight the associated topological responses in periodically driven systems [1] and non-Hermitian systems [2]. In addition, I will further discuss a recent generalization of chirality that only exists in non-relativistic systems in two spatial dimensions and its experimental realization in topolectric circuits [3].

[1] XQ Sun, M Xiao, T Bzdušek, SC Zhang, S Fan, Phys. Rev. Lett. 121, 196401(2018).

[2] XQ Sun, P Zhu, TL Hughes, Phys. Rev. Lett. 127, 066401(2021).

[3] P Zhu, XQ Sun, TL Hughes, G Bahl, to appear on Nat. Comm. (2023)

个人简介: Dr. Xiaoqi Sun is currently a Gordon and Betty Moore Postdoctoral Scholar at the Institute for Condensed Matter Theory in the University of Illinois at Urbana-Champaign. He completed his B.S. in physics at Tsinghua University, and his Ph.D. in physics at Stanford University. His current research interests involve topological phenomena out of equilibrium, dynamics and transport in quantum materials, and interdisciplinary studies at the intersection of many-body physics, machine learning and quantum information science.