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Surface chiral metal in the bulk half-integer quantum Hall effect of BaMnSb<sub>2</sub>

ORAL

Abstract

The study of Quantum Hall effect (QHE) in two-dimensional (2D) systems such as 2D electron gas and graphene has led to important breakthroughs in the development of many new concepts in modern physics. Although the QHE is not generally expected for bulk materials due to the band dispersion along the magnetic field direction, bulk QHE has been observed in a few materials such as Cd3As2 (1), ZrTe5 (2) and EuMnBi2 (3). In this talk, we report a unique bulk half-integer QHE observed in a layered Dirac semimetal BaMnSb2. In the extreme quantum limit, its quantum Hall state is accompanied by two-dimensional chiral metal at the surface, which represents a novel quantum liquid, never observed in any other bulk single crystal materials [4]. This finding establishes a promising experimental platform which not only provides access to 3D interacting topological states, but also offers opportunities to investigate the novel physics of 2D chiral metal.
References:
1. C. Zhang et al., Nature. 565, 331 (2019).
2. F. Tang et al., Nature. 569, 537 (2019).
3. H. Masuda et al., Science Advances. 2, e1501117 (2016).
4. J.Y. Liu et al., arXiv:1907.06318

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Presenters

  • Zhiqiang Mao

    Pennsylvania State University, Tulane University, Physics, Pennsylvania State University, Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Penn State University, Physics, Penn State University, The Pennsylvania State University

Authors

  • Jinyu Liu

    Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA, Tulane Univ, Tulane University

  • Jiabin Yu

    Pennsylvania State University

  • Jinliang Ning

    Physics and Engineering Physics, Tulane University, Tulane Univ

  • Leixin Miao

    Materials Science and Engineering, Penn State University, Pennsylvania State University, Pennsylvania state University

  • Lujin Min

    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802, USA, Pennsylvania State University, Pennsylvania state University

  • Kleyser E Agueda Lopez

    Pennsylvania State University

  • Yanglin Zhu

    Department of Physics, Pennsylvania State University, Pennsylvania State University

  • Hemian Yi

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

  • Timothy Pillsbury

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

  • Yubo Zhang

    Tulane University, Tulane Univ

  • Yu Wang

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

  • Jin Hu

    Univ of Arkansas-Fayetteville, Physics, Univ of Arkansas-Fayetteville, University of Arkansas

  • Huibo Cao

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

  • Fedor Balakirev

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

  • Franziska Weickert

    Los Alamos National Laboratory, National High Magnetic Field Laboratory

  • Marcelo Jaime

    Los Alamos Natl Lab, Los Alamos National Laboratory, NHMFL, LANL

  • Kun Yang

    National High Magnetic Field Laboratory

  • Jianwei Sun

    Tulane Univ, Tulane University, Physics and Engineering Physics, Tulane University

  • Nasim Alem

    Pennsylvania State University, Pennsylvania state University

  • Venkatraman Gopalan

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

  • Nitin Samarth

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

  • Chaoxing Liu

    Physics department, Pennsylvania State University, Pennsylvania State University

  • Ross McDonald

    Los Alamos National Laboratory, physics, los alamos national lab, NHMFL-PFF, Los Alamos National Laboratory, Los Alamos Natl. Lab, Los Alamos Natl Lab, National High Magnetic Field Laboratory, LANL

  • Zhiqiang Mao

    Pennsylvania State University, Tulane University, Physics, Pennsylvania State University, Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Penn State University, Physics, Penn State University, The Pennsylvania State University