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Spin-valley locking bulk quantum Hall effect in a Dirac semimetal BaMnSb<sub>2</sub>

ORAL

Abstract

Spin-valley locking in the band structure of in monolayers of group-VI transition metal dichalcogenides such as MoS2 has attracted enormous interests. In this talk, we report a non-centrosymmetric Dirac semimetal BaMnSb2 is characterized by spin-valley locking[1]. This is revealed by comprehensive studies using first-principle calculations, tight-binding and effective model analyses, and angle-resolved photoemission spectroscopy. Moreover, this material also exhibits a stacked quantum Hall effect. The spin-valley degeneracy extracted from the plateau height of quantized Hall resistivity is close to 2, further confirming the spin-valley locking picture. In the extreme quantum limit, we have also observed a two-dimensional chiral metal at the side surface. These findings establish BaMnSb2 as a rare platform for exploring coupled spin and valley physics in bulk single crystals and accessing 3D interacting topological states.
[1] Liu et al., arXiv:1907.06318

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Presenters

  • Zhiqiang Mao

    Pennsylvania State University, Department of Physics, Penn State University, The Pennsylvania State University, Penn State University, Physics, Penn State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University, Physics, Pennsylvania State University, Department of Materials Science and Engineering, Pennsylvania State University

Authors

  • Jinyu Liu

    Tulane University

  • Jiabin Yu

    Pennsylvania State University, Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park

  • Jinliang Ning

    Tulane University, Physics and Engineering Physics, Tulane University

  • Hemian Yi

    Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Leixin Miao

    Pennsylvania State University

  • Lujin Min

    Department of Material Science and Engineering, Penn State University, Department of Physics, Pennsylvania State University, Physics, Pennsylvania State University, Pennsylvania State University, Department of Materials Science and Engineering, Pennsylvania State University

  • Yifan Zhao

    Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Wei Ning

    Pennsylvania State University

  • Yanglin Zhu

    The Pennsylvania State University, Physics, Penn State University, Pennsylvania State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University

  • Timothy S Pillsbury

    Pennsylvania State University, Physics, The Pennsylvania State University, Physics, Pennsylvania State University, The Pennsylvania State University

  • Yubo Zhang

    Tulane University, Tulane Univ

  • Jin Hu

    University of Arkansas, The University of Arkansas

  • Huibo Cao

    Oak Ridge National Lab, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA, Neutron Scattering, Oak Ridge National Laboratory, Oak Ridge National Laboratory

  • Fedor F Balakirev

    Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory

  • Dagmar F Weickert

    Los Alamos National Laboratory

  • Marcelo Jaime

    Los Alamos National Laboratory, Los Alamos Natl Lab, National High Magnetic Field Laboratory (NHMFL), Los Alamos

  • Kun Yang

    Florida State University

  • Jianwei Sun

    Tulane Univ, Physics, Tulane U., Tulane, Department of Physics and Engineering Physics, Tulane University, Physics and Engineering Physics, Tulane University, Tulane University, Tulane U.

  • Nasim Alem

    Penn State University, Pennsylvania State University

  • Venkatraman Gopalan

    Pennsylvania State University, Material Science and Engineering, Pennsylvania State University, Department of Material Science and Engineering, Penn State University, Department of Materials Science and Engineering, Pennsylvania State University, Materials Science and Engineering, Pennsylvania State University

  • Cui-Zu Chang

    Pennsylvania State University, Department of Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, The Pennsylvania State University

  • Nitin Samarth

    Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University, Physics, Pennsylvania State University, The Pennsylvania State University

  • Chaoxing Liu

    The department of Physics, Pennsylvania State University, Pennsylvania State University, Department of Physics, the Pennsylvania State University, University Park

  • Ross McDonald

    Los Alamos National Laboratory, Los Alamos Natl Lab

  • Zhiqiang Mao

    Pennsylvania State University, Department of Physics, Penn State University, The Pennsylvania State University, Penn State University, Physics, Penn State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University, Physics, Pennsylvania State University, Department of Materials Science and Engineering, Pennsylvania State University