Fermi Surface Evolution across the Weyl Nodes in MnBi<sub>2-x</sub>Sb<sub>x</sub>Te<sub>4</sub>

ORAL

Abstract

A Weyl semimetal is a nontrivial topological phase whose energy bands cross at pairs of nodes with opposite chirality. A number of Weyl semimetals have been identified but typically possess multiple pairs of Weyl nodes and complicated Fermi pockets. Here, we report the quantum oscillation measurements of a Weyl semimetal candidate, MnBi2-xSbxTe4 in the Field-induced ferromagnetic (FM) phase. As the Fermi level is tunned from the conduction band to the valence band, the Fermi surfaces evolve from a single-electron pocket to the coexistence of electron and hole pockets, finally to a single hole pocket. This evolution is consistent with the existence of a single pair of Weyl nodes. Hence our results establish that MnBi2-xSbxTe4 is a clean system to study the low energy Weyl excitations without the interference of trivial energy bands.

*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

  • Johanna Palmstrom

    • Los Alamos National Laboratory
    • Los Alamos National Lab

  • John Singleton

    • Los Alamos Natl Lab
    • NHMFL, Los Alamos National Lab
    • NHMFL/ LANL

  • Shalinee Chikara

    • National High Magnetic Field Laboratory
    • Florida State University

  • David E Graf

    • Florida State University
    • National High Magnetic Field Laboratory
    • NHMFL, Florida State University
    • National High Magnetic Field Laboratory and Department of Physics, Florida State University

  • Paul T Malinowski

    • University of Washington

  • Yue Shi

    • University of Washington

  • Aaron Wang

    • University of Washington

  • Zhong Lin

    • University of Washington

  • Chong Wang

    • Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA
    • Carnegie Mellon Univ
    • University of Washington
    • University of Washington, Seattle
    • Carnegie Mellon University

  • Xiaodong Xu

    • University of Washington

  • Di Xiao

    • University of Washington
    • Department of Physics, University of Washington, Seattle, WA, USA. Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA
    • University of Washington, Seattle

  • Jiun-Haw Chu

    • University of Washington