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Quantum Oscillations in Intrinsic Magnetic Topological Insulator MnBi<sub>2-x</sub>Sb<sub>x</sub>Te<sub>4</sub>

ORAL

Abstract

The recently discovered first intrinsic antiferromagnetic (AFM) topological insulator (TI) MnBi2Te4 is expected to possess various exotic quantum states including axion insulator and quantum anomalous Hall effect. The band structure portrayed by ARPES measurements reveals nontrivial topology, but claims regarding the surface states are still controversial. When Bi is substituted by Sb, the material crosses a bulk charge neutrality point, from being electron-doped to hole-doped. By applying a magnetic field, it is possible to realize a magnetic Weyl semimetal phase by switching the AFM phase to the FM phase through a meta-magnetic transition at B ~ 6T. Here, we present Shubnikov–de Haas oscillations of both electron and hole-doped MnBi2-xSbxTe4 in the FM state and trace its evolution as a function of chemical doping, providing the first measurement of the band structures of MnBi2-xSbxTe4 in the FM state.

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Presenters

  • Qianni Jiang

    University of Washington

Authors

  • Qianni Jiang

    University of Washington

  • Zaiyao Fei

    University of Washington, Physics, University of Washington

  • Tiancheng Song

    University of Washington

  • Jiaqiang Yan

    Materials Science and Engineering, The University of Tennessee, Oak Ridge National Lab, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Lab, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • Paul Malinowski

    University of Washington

  • Zhaoyu Liu

    University of Washington

  • David E Graf

    Florida State University, National High Magnetic Field Laboratory, Florida State University, Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Lab, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory-Florida State University, National High Magnetic Field Laboratory, Tallahassee, FL, NHMFL, Florida State University, NHMFL

  • Xiaodong Xu

    University of Washington, Physics, University of Washington

  • Jiun-Haw Chu

    University of Washington, Department of Physics, University of Washington, Physics, University of Washington