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

*Z.Q.M. acknowledges the support by the DOE under grant DE-SC0019068

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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