Tunable Chern Insulators in Moiré-Distant and Moiré-Proximal Rhombohedral Multilayer Graphene

ORAL

Abstract

In this talk, we report on the electrical transport properties of rhombohedral multilayer graphene/hexagonal boron nitride (RMG/hBN) moiré superlattices. By fabricating a controlled pair of devices with opposite hBN alignment orientations, we find that the integer and fractional quantum anomalous Hall effects (IQAHE and FQAHE) in the moiré-distant region are unaffected by the alignment orientation. In contrast, the moiré-proximal region exhibits a pronounced dependence on the hBN orientation: only one alignment configuration shows an anomalous Hall effect near ν = 1, which evolves into topological Chern insulators under a small magnetic field. Moreover, the Chern number can be tuned by both magnetic and displacement electric fields. These results provide important insights into understanding the FQAHE in the moiré-distant region.

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Presenters

  • Chushan Li

    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China

Authors

  • Chushan Li

    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China

  • Chuanqi Zheng

    • Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China

  • Zheng Sun

    • Shanghai Jiao Tong Univ
    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
    • Shanghai Jiao Tong Univesity

  • kai liu

    • Shanghai Jiao Tong Univ
    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China

  • Lei Qiao

    • Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing, China

  • Yifan wei

    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China

  • Chenyu Zhang

    • Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Bingbing Tong

    • Institute of Physics, Chinese Academy of Sciences
    • Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
    • Chinese Academy of Sciences

  • Li Lu

    • Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China

  • Jinfeng Jia

    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
    • Shanghai Jiao Tong Univ

  • Zhiwen Shi

    • Shanghai Jiao Tong University
    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

  • Jianpeng Liu

    • School of Physical Science and Technology, ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai ,China
    • ShanghaiTech University

  • Guorui Chen

    • Shanghai Jiao Tong Univ
    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China

  • Tingxin Li

    • Shanghai Jiao Tong Univ
    • School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
    • Shanghai Jiao Tong Univesity

  • Xiaoxue Liu

    • Shanghai Jiao Tong Univ
    • Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai,China
    • Shanghai Jiao Tong Univesity