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.

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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