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JITCP Seminar: Trivial Insulating Phase at ν=3 in Twisted Bilayer Graphene

Speaker:Prof. Jian KANG
Affiliation:School of Physical Science and Technology, ShanghaiTech University, China
Date:March 28, 2023 (Tuesday)
Time:1:30 p.m.
Venue:Room 522, 5/F, Chong Yuet Ming Physics Building, The University of Hong Kong


In this talk, I will discuss recent theoretical progress on the insulating phase at ν=3 discovered in twisted bilayer graphene. While experiments discovered this phase is topologically trivial, most theoretical calculations obtain either the metallic state with nodes or the quantum anomalous Hall state that is gapped but topologically nontrivial. In this talk, I will present both the analytical and numerical evidence for the stripe phase at ν=3, and discuss how the nodes can be annihilated by braiding and lead to a trivial insulating state.

1. J Kang and O Vafek, Phys. Rev. Lett., 122, 246401 (2019).
2. J Kang and O Vafek, Phys. Rev. B, 102, 035161 (2020).
3. F Xie, J Kang, BA Bernevig, O Vafek, and N Regnault, Phys. Rev. B 107, 075156 (2023).

This event is organized by the HKU-UCAS Joint Institute of Theoretical and Computational Physics and HK Institute of Quantum Science & Technology

Anyone interested is welcome to attend.