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.

*This work is supported as part of Programmable Quantum Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under award DE-SC0019443.

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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