Local geometry, global topology and two-parameter scalings of transports in topological phase transitions

by Prof. Jinwu Ye (Great Bay University)

Monday 25 Aug 2025, 14:00 → 15:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N601 - Meeting Room (Tsung-Dao Lee Institute)

Tencent meeting link:  https://meeting.tencent.com/dm/qAOjstlvlNqT 

 Meeting ID:  460138765, no password

 

Abstract:

There are recent flurries of experimental research activities on possible integer and fractional quantum anomalous Hall states in various 2d or layered 2d materials. As the sample quality gets better and better, the plateaus get quantized more or more precisely at integer or fractional values, it becomes important to study the topological phase transitions (TPT) between different gapped topological phases. Here we show that the TPTs can effectively detected by measuring transport properties at finite temperatures. They satisfy two-parameter scalings determined by both the infra-red and the ultra-violet properties of the system which dictate the local geometry and the global topology respectively. Our methods and results may also lead to a resolution of several long-standing puzzles in the quantum critical scalings of the plateau-plateau transitions in integer and fractional quantum Hall systems at a finite temperature. Experimental detections are discussed. Various perspectives are given.

 

Biography:

Prof. Ye received Ph.D from Yale University. Currently, he is a chair professor at the newly found Great Bay university in Dongguan, Guangdong, China. He is a condensed matter theorist working on the interdisciplinary field of condensed matter, quantum optics, cold atoms, non-relativistic quantum field theory and conformal field theory. Recently, he has been particularly interested to explore possible deep connections among quantum/topological phases, Sachdev-Ye-Kitaev models and quantum black holes from material's point of views.