报告题目：How to diagnose a topological phase transition at a finite temperature

报 告 人: Jinwu Ye, Great Bay University

报告时间：2025年4月29日14:00

报告地点：物理楼W105

内容摘要：Quantum phase transition at zero temperature (QPT) can be probed by measuring various thermodynamics quantities at a finite temperature. They satisfy  single-parameter scalings determined by the infra-red  properties of the system which dictate the local geometry. How to detect a topological phase transition (TPT)  at zero temperature remains unexplored and challenging. Here we show that it can be diagnosed by measuring transport properties at a finite temperature. They satisfy two-parameter scalings determined by both the infra-red and the ultra-violet properties of the system which dictate the global topology. We demonstrate our findings by studying the TPTs in the Quantum Anomalous Hall systems. Our methods and results may lead to a resolution of several  long-standing puzzles on the nature of plateau-plateau transitions in integer and fractional quantum Hall systems. They can also be extended to explore TPTs in many other systems. Experimental detections  at a finite temperature are discussed.

报告人简介：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. 教育部重大人才工程讲席教授(2023). 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.