Fermi Surfaces in Kondo Insulators

ORAL

Abstract

We report experimental signatures signifying the existence of bulk Fermi surfaces in the Kondo insulator family and compare these with theoretical models. We have observed quantum oscillations, traditionally considered a hallmark of Fermi liquids, in magnetization in the Kondo insulator SmB6 [Hartstein et al., nphys4295]. The quantum oscillations, taken together with measured finite specific heat coefficient at low temperatures, finite quantum oscillatory entropy, and magnetic field enhancement of thermal conductivity, suggest the existence of bulk Fermi surfaces that originate from novel quasiparticles that couple to magnetic fields but not DC electric fields. Since our experimental observation, a number of innovative theories have been proposed to explain how a Fermi surface could arise in charge gapped Kondo insulators. Here, we explore experimental signatures in light of these theoretical proposals.

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Presenters

  • Hsu Liu

    Univ of Cambridge

Authors

  • Hsu Liu

    Univ of Cambridge

  • Mate Hartstein

    Univ of Cambridge

  • William Toews

    University of Waterloo

  • Yu-Te Hsu

    Cavendish Laboratory, Univ of Cambridge, Univ of Cambridge

  • Bin Zeng

    National High Magnetic Field Laboratory

  • Xiaoye Chen

    Univ of Cambridge

  • Monica Ciomaga Hatnean

    Physics, University of Warwick, University of Warwick

  • Michelle Johannes

    Naval Research Lab, Center for Computational Materials Science, Naval Research Lab, Naval Research Laboratory

  • Qiu Run Zhang

    Florida State University

  • Shota Nakamura

    University of Tokyo

  • Andrew padgett

    University of Florida

  • Gilles Rodway-Gant

    University of Oxford

  • Mun Chan

    Los Alamos National Laboratory, National High Magnetic Field Laboratory, MPA-MAG, Los Alamos National Laboratory

  • Satoshi Yamashita

    University of Osaka

  • Toshio Sakakibara

    Institute for Solid State Physics, The University of Tokyo, University of Tokyo

  • Yasumasa Takano

    University of Florida

  • Ju-Hyun Park

    NHMFL, National High Magnetic Field Laboratory

  • Luis Balicas

    Natl High Magnetic Field Lab, Nat. High Magn. Field Lab., Florida State University, FSU-NHMFL, National High Magnetic Field Lab, National High Magnetic Field Laboratory, Natl. High Magnetic Field Lab, Florida State University, High Field Magnet Lab, 1800 E. Paul Dirac Drive, National High Magnetic Field Laboratory, Natl High Magnetic Field Lab

  • Neil Harrison

    National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos Natl Lab, National High Magnetic Field Laboratory, LANL/NHMFL

  • Natalya Shitsevalova

    The National Academy of Sciences of Ukraine

  • Geetha Balakrishnan

    Department of Physics, University of Warwick, Physics, University of Warwick, University of Warwick

  • Gilbert Lonzarich

    Cavendish Laboratory, Univ of Cambridge, Univ of Cambridge, Cavendish Laboratory, Cambridge University

  • Robert Hill

    University of Waterloo

  • Michael Sutherland

    Univ of Cambridge

  • Suchitra Sebastian

    Cavendish Laboratory, Univ of Cambridge, Univ of Cambridge, Cavendish Laboratory, University of Cambridge