Two-Dimensional Topological Insulator State and Topological Phase Transition in Bilayer Graphene

ORAL

Abstract

In this talk, we show that gated AB-stacking bilayer graphene can host a quantum phase transition from a quantum valley Hall (QVH) insulator to a two-dimensional strong topological insulator (TI) as a function of Rashba spin-orbit (SO) coupling. Different from a conventional TI phase, the edge modes of our strong TI phase exhibit both spin and valley filtering, and thus share the properties of both TI and QVH insulators. The strong TI phase remains robust in the presence of weak intrinsic SO coupling.

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Authors

  • Zhenhua Qiao

    Department of Physics, The University of Texas at Austin, Austin, Texas 78712 USA, Department of Physics, The University of Texas at Austin

  • Wang-Kong Tse

    University of Texas at Austin, Department of Physics, The University of Texas at Austin, Austin, Texas 78712 USA

  • Hua Jiang

    International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Yugui Yao

    School of Physics, Beijing Institute of Technology, Beijing 100081, China

  • Qian Niu

    The University of Texas at Austin, University of Texas at Austin, Department of Physics, The University of Texas at Austin, Austin, Texas 78712 USA, Department of Physics, The University of Texas at Austin