Intrinsic magnetic topological insulator MnBi2Te4

ORAL

Abstract

The interplay of magnetism and topology offers great opportunities to explore variant emerging topological quantum phenomena. Here we will present that van der Waals layered MnBi2Te4-related materials intrinsically host nontrivial band topology, which possess A-type antiferromagnetism characterized by ferromagnetic intralayer and antiferromagnetic interlayer coupling. Extremely rich 2D and 3D topological quantum states emerge in MnBi2Te4, including 3D antiferromagnetic topological insulator with the long-sought topological axion states on the surface, the simple magnetic Weyl semimetal with one pair of Weyl points, as well as intrinsic axion insulators and QAH insulators in even- and odd-layer films, respectively [1]. Furthermore, we will show a series of magnetically controllable topological quantum phase transitions in the material [2]. Relevant experimental progresses will also be introduced [3-5].
[1] J. Li et al., Sci. Adv. 5, eaaw5685 (2019)
[2] J. Li et al., Phys. Rev. B 100, 121103(R) (2019)
[3] Y. Gong et al., Chin. Phys. Lett. 36, 7 (2019)
[4] C. Liu et al., arXiv: 1905.00715
[5] J. Ge et al., arXiv: 1907.09947

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Presenters

  • Jiaheng Li

    Tsinghua University, State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Department of Physics, Tsinghua University

Authors

  • Jiaheng Li

    Tsinghua University, State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Department of Physics, Tsinghua University

  • Duan Wenhui

    State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics,, Tsinghua University, Tsinghua University, Department of Physics, Tsinghua University

  • Yong Xu

    Tsinghua University, Department of Physics, Tsinghua University, Collaborative Innovation Center of Quantum Matter and State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, China