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Gapless surface Dirac cone and its possible origin in antiferromagnetic topological insulator MnBi<sub>2</sub>Te<sub>4</sub>

ORAL

Abstract

The recent discovered antiferromagnetic topological insulators in the Mn-Bi-Te family have rapidly drawn broad interest since its cleaved surface state is believed to be gapped, hosting the unprecedented axion states. However, we show by ARPES that a gapless Dirac cone at the (0001) surface of MnBi2Te4 exists inside the bulk band gap. Such unexpected surface state remains unchanged across the bulk Néel temperature, and is robust against severe surface degradation, indicating additional topological protection. Through symmetry analysis and ab initio calculations we consider different types of surface magneitc reconstruction as possible origins giving rise to such linear dispersion. Our results reveal that the intrinsic magnetic topological insulator hosts a rich platform to realize various topological phases, and thus pushed forward the comprehensive understanding of magnetic topological materials.

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Presenters

  • Chang Liu

    physics, Southern University of Science and Technology, Physics, Southern University of Science and Technology, Southern University of Science and Technology

Authors

  • Yu-Jie Hao

    Physics, Southern University of Science and Technology

  • Pengfei Liu

    Physics, Shenzhen Institute for Quantum Science and Technology, Physics, Southern University of Science and Technology, Department of Physics, Southern University of Science and Technology

  • Yue Feng

    Physics, Southern University of Science and Technology

  • Xiao-Ming Ma

    physics, Southern University of Science and Technology, Physics, Southern University of Science and Technology, Southern University of Science and Technology

  • Eike F. Schwier

    Hiroshima University, Hiroshima Synchrotron Radiation Center, Hiroshima University

  • Masashi Arita

    Hiroshima University, Hiroshima Synchrotron Radiation Center, Hiroshima University

  • Shiv Kumar

    Hiroshima Synchrotron Radiation Center, Hiroshima University

  • Chaowei Hu

    Physics, University of California, Los Angeles, Physics and Astronomy, UCLA, Physics and Astronomy, Univerisity of California, Los Angeles, University of California, Los Angeles, Department of Physics and Astronomy and California NanoSystems Institute, University of California, Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA, University of California Los Angeles

  • Rui'e Lu

    Physics, Southern University of Science and Technology, Southern University of Science and Technology

  • Meng Zeng

    Physics, Southern University of Science and Technology, Southern University of Science and Technology

  • Yuan Wang

    Physics, Southern University of Science and Technology

  • Zhanyang Hao

    Physics, Southern University of Science and Technology

  • Hong-Yi Sun

    Physics, Southern University of Science and Technology

  • Ke Zhang

    Hiroshima Synchrotron Radiation Center, Hiroshima University

  • Jiawei Mei

    Physics, Southern University of Science and Technology

  • Ni Ni

    Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA, Physics and Astronomy, Univerisity of California, Los Angeles

  • Liusuo Wu

    Physics, Southern University of Science and Technology

  • Kenya Shimada

    Hiroshima University, Hiroshima Synchrotron Radiation Center, Hiroshima University

  • Chaoyu Chen

    Physics, Southern University of Science and Technology, the school of Physics, Southern University of Science and Technology

  • Qihang Liu

    physics, Southern University of Science and Technology, Physics, Shenzhen Institute for Quantum Science and Technology, Physics, Southern University of Science and Technology, Southern University of Science and Technology, Department of Physics, Southern University of Science and Technology

  • Chang Liu

    physics, Southern University of Science and Technology, Physics, Southern University of Science and Technology, Southern University of Science and Technology