Magnetic field induced Weyl points and anomalous transport in Bi<sub>89</sub>Sb<sub>11</sub>

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)

*This research is supported by the Center for Emergent Materials, an NSF MRSEC, under Award Number DMR-1420451.

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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