Great Bay University

Address: M830

Abstract:

The Quantum Anomalous Hall system at zero temperature hosts topological phase transitions (TPT) with universal integer Hall conductance jumps. By using both effective field theory and microscopic lattice approach, we show that at a finite temperature near the two TPTs,various thermodynamics quantities satisfy single-parameter scalings determined by the infra-red properties of the system which dictate the local geometry in the momentum space. However,the transport properties satisfy two-parameter scalings determined by both the infra-red and the ultra-Violet properties of the system which dictate the global topology in the momentum space. Our results may also lead to a resolution of several long-standing puzzles in the quantum critical scaling of plateau-plateau transitions in integer and fractional quantum Hall systems at a finite temperature. Experimental detections are discussed. Various perspectives are given.

Speaker:

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.

Inviter: Wuming Liu (82469249)