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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.

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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