Colossal Bulk Photovoltaic Effect in a Weyl Semimetal

 · Invited

Abstract

The bulk photovoltaic effect (BPVE) is a second-order non-linear optical effect which directly converts light into an electrical current. This effect is intimately related to the topological nature of the material, and is in fact directly proportional to the Berry connection. We present photocurrent measurements on the Weyl semimetal TaAs, where the diverging Berry connection leads to the largest observed BPVE, as well as the first observation of BPVE utilizing mid-infrared radiation.

*U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Award No. DE-SC0018675
National Science Foundation, Award No. DMR-1709987
DAAD RISE Fellowship
National Science Foundation, Award No. DMR-1151440
U.S. Depratment of Energy, Office of Science, Office of Basic Energy Research, Award No. DE-SC0011978
European Research Council, European Union Horizon 2020 Research and Innovation Programme, No. 715730

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Presenters

  • Gavin B Osterhoudt

    • Boston College

Authors

  • Gavin B Osterhoudt

    • Boston College

  • Laura Katharina Diebel

    • Boston College

  • Mason Gray

    • Boston College
    • Physics, Boston College

  • Xu Yang

    • Boston College

  • John Stanco

    • Boston College

  • Xiangwei Huang

    • Max Planck Institute for Chemical Physics of Solid

  • Bing Shen

    • University of California Los Angeles
    • School of Physics, Sun Yat-Sen University, China
    • Univ of California Los Angeles

  • Ni Ni

    • Physics and Astronomy, university of california los angeles
    • Univ of California Los Angeles

  • Philip Moll

    • Ecole polytechnique federale de Lausanne
    • Swiss Federal Institute of Technology in Lausanne
    • École Polytechnique Fédérale de Lausanne (EPFL), Institute of Materials, Lausanne, Switzerland
    • Institute of Materials, Ecole Polytechnique Federale de Lausanne
    • Ecole Polytechnique Federale de Lausanne

  • Ying Ran

    • Boston College
    • Boston Coll

  • Kenneth Burch

    • Boston College