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Quantum Oscillations in the Field-Induced Ferromagnetic State of MnBi<sub>2-x</sub>Sb<sub>x</sub>Te<sub>4</sub>

ORAL

Abstract

The intrinsic antiferromagnetic (AFM) topological insulator (TI) MnBi2Te4 is expected to possess various exotic quantum states including axion insulator and quantum anomalous Hall effect. 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 MnBi2-xSbxTe4 in a wide range of Sb concentrations close to the charge neutrality point (0.33 ≤ x ≤ 1.21) in the FM state. The evolution of the oscillation frequency and the effective mass shows a good agreement with the Weyl semimetal band-structure of ferromagnetic MnBi2Te4 predicted by density functional calculations. Intriguingly, the quantum oscillation frequency shows a strong temperature dependence, indicating that the electronic structure sensitively depends on magnetism.

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Presenters

  • Qianni Jiang

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

Authors

  • Qianni Jiang

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

  • Chong Wang

    Department of Physics, Carnegie Mellon University, Physics, Carnegie Mellon University, Carnegie Mellon University, Carnegie Mellon Univ

  • Paul Malinowski

    University of Washington

  • Zhaoyu Liu

    University of Washington

  • Yue Shi

    University of Washington

  • Zhong Lin

    University of Washington

  • Zaiyao Fei

    Department of Physics, University of Washington, University of Washington

  • Tiancheng Song

    Department of Physics, University of Washington, University of Washington

  • David E Graf

    National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory, Tallahassee and Florida State University, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory (FSU), Department of Physics, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, National High Magnetic Field Lab, National High Magnetic Field Laboratory, Tallahassee, FL, CMS, National High Magnetic Laboratory

  • Shalinee Chikara

    National High Magnetic Field Laboratory, National HIgh Magnetic Field Laboratory, Florida State University

  • Xiaodong Xu

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

  • Jiaqiang Yan

    Materials Science and Technology Division, Oak Ridge National Lab, Oak Ridge National Laboratory, University of Tennessee, Oak Ridge National Lab, Materials Science and Technology Division, Oak Ridge National Laboratory, Materials Science and Technology, Oak Ridge National Laboratory, Oak Ridge National Laboratory, Materials Science and Technology Division

  • Di Xiao

    Carnegie Mellon Univ, Carnegie Mellon University, Department of Physics, Carnegie Mellon University, Physics, Carnegie Mellon University

  • Jiun-Haw Chu

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