Berry curvature-induced huge anomalous Nernst effect in the absence of magnetic field in the Weyl semimetal YbMnBi<sub>2</sub>

ORAL

Abstract

YbMnBi2, a Type II time-reversal symmetry-breaking Weyl semimetal, yields a huge anomalous Nernst effect (ANE). This ANE is proven to be driven by Berry curvature and is present even in the absence of a magnetic field. The Seebeck thermopower, in contrast, is near zero. By combining magnetoresistance, Hall, Seebeck, and Nernst effects, the actual integral over the Fermi surface of the projection of the Berry phase can be derived. The ANE also results in transverse energy conversion ZT (thermoelectric figure of merit) values that compare favorably to those of conventional thermoelectric materials in the cryogenic temperature range.

*This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-0822215.

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Presenters

  • Sarah Watzman

    • Ohio State Univ - Columbus
    • The Ohio State University

Authors

  • Sarah Watzman

    • Ohio State Univ - Columbus
    • The Ohio State University

  • Kaustuv Manna

    • Max Planck Institute for Chemical Physics of Solids

  • Timothy McCormick

    • Ohio State Univ - Columbus

  • Satya Guin

    • Max Planck Institute for Chemical Physics of Solids

  • Chandra Shekhar

    • Max Planck Institute for Chemical Physics of Solids
    • solid State Chemistry, Max-Planck-Institute for Chemical Physics of Solids,

  • Nandini Trivedi

    • The Ohio State University
    • Physics, The Ohio State University
    • Physics, Ohio State Univ - Columbus
    • Ohio State Univ - Columbus
    • Physics Department, Ohio State University
    • Department of Physics, The Ohio State University
    • Ohio State University
    • Department of Physics, Ohio State Univ - Columbus

  • Claudia Felser

    • Max Planck Institute for the Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute
    • solid State Chemistry, Max-Planck-Institute for Chemical Physics of Solids,

  • Joseph P Heremans

    • Mechanical and Aerospace Engineering, The Ohio State University
    • Mechanical and Aerospace Engineering, Ohio State Univ - Columbus
    • Ohio State Univ - Columbus
    • Department of Mechanical and Aerospace Engineering, The Ohio State University