Magnetic field induced Weyl points and anomalous transport in Bi89Sb11

ORAL

Abstract

A significant enhancement of magneto thermal conductivity in semimetal Bi1-x Sbx alloy for a particular Sb concentration x=11% was discovered. As shown in a previous theoretical work on Weyl semimetals [1], Fermi arcs provide efficient ``conveyor belt'' for magneto thermal transport. In this talk, we argue that Bi1-x Sbx becomes a Weyl semimetal under magnetic field and the enhancement of magneto thermal conductivity is due to the resulting Fermi arcs, based on the tight binding parameterization calculated by a modified virtual crystal approximation. By calculating Chern numbers on two-dimensional slices of the three-dimensional Brillouin zone, we show that a pair of Weyl points appear near L points above a critical field strength, and that the seperation between those Weyl points increases with the field strength which explains the anomalous angular dependence of magneto thermal conductivity on magnetic field.

[1] T. McCormick et al., Phys. Rev. B 97 195152 (2018)

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Presenters

  • WENJUAN ZHANG

    Department of Physics, The Ohio State University, Department of Physics, Ohio State University

Authors

  • WENJUAN ZHANG

    Department of Physics, The Ohio State University, Department of Physics, Ohio State University

  • Dung Vu

    Department of Mechanical Engineering, The Ohio State University, Department of Mechanical and Aerospace Engineering, The Ohio State University

  • Cuneyt Sahin

    Physics and Astronomy, University of Iowa, Iowa City, Department of Physics and Astronomy, University of Iowa, Optical Science and Technology Center and Department of Physics and Astronomy, University of Iowa

  • Michael Flatté

    Optical Science and Technology Center and Department of Physics and Astronomy, University of Iowa, Department of Physics and Astronomy and Optical Science and Technology Center, University of Iowa, Physics and Astronomy, University of Iowa, Iowa City, University of Iowa, Department of Physics and Astronomy, University of Iowa, Physics and Astronomy, University of Iowa

  • Nandini Trivedi

    Ohio State University, Department of Physics, The Ohio State University, Department of Physics, Ohio State University, The Ohio State University, Physics, Ohio State University

  • Joseph P C Heremans

    Department of Mechanical and Aerospace Engineering, The Ohio State University, Ohio State University, Ohio State Univ - Columbus, Department of Mechanical Engineering, The Ohio State University, Department of Mechanical and Aerospace Engineering, Department of Physics, Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA