February: Jiabin Yu

Moiré fractional Chern insulators

Jiabin Yu

Princeton University

Wednesday, February 21

2:00 pm ET/11:00 am PT

Abstract:

Fractional Chern Insulators (FCIs) are the zero-field analogs of the fractional quantum Hall effect, induced by the Coulomb interaction in fractionally filled, (nearly-)flat topological bands. Recently, FCIs were observed in twisted bilayer MoTe2 and pentalayer graphene-hBN superlattices. In this talk, I will first show how band mixing is key to explaining various experimental puzzles in twisted bilayer MoTe2. Then, I will present the explanations of the Chern insulator phases in pentalayer graphene-hBN superlattice, and discuss the subtlety in explaining the FCIs in the system. Potential future directions will be touched on.

Bio:

Dr. Jiabin Yu received his Ph.D. in physics from the Pennsylvania State University, University Park, in 2020, under the supervision of Prof. Chao-Xing Liu. He then spent two years as a postdoctoral fellow at the Condensed Matter Theory Center in University of Maryland, College Park, primarily working with Prof. Sankar Das Sarma. He is currently a Moore postdoctoral fellow at Princeton University, working in close collaboration with Prof. B. Andrei Bernevig since fall 2022.