Resonance enhanced nonlinear optical conductivity in Weyl semimetal TaAs

ORAL

Abstract

Weyl semimetals are a class of materials with nontrivial band structure geometry, and have recently been shown to host a variety of exotic nonlinear optical properties, including the largest measured second-order optical susceptibility χ(2). Here we report the measurement of the spectrum of nonlinear optical susceptibility χ(2)(ω) in the visible and near-infrared spectral range from photon energies of 0.5eV to 1.5eV. We observe that χ(2)(ω) has a sharp peak in amplitude at 0.7eV, and that the peak value is over four orders of magnitude higher than that of a standard nonlinear optical semiconductor, GaAs. The spectral lineshape of χ(2)(ω) is consistent with the prediction from a theoretical model of optical nonlinearity in 1D Rice-Mele chains and the magnitude of the frequency-integrated response saturates a universal bound that emerges from the model.

*Gordon and Betty Moore Foundation
Temple University
US Department of Energy

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Presenters

  • Shreyas Patankar

    • Physics, Univ of California - Berkeley
    • Univ of California - Berkeley
    • Physics, University of California, Berkeley

Authors

  • Shreyas Patankar

    • Physics, Univ of California - Berkeley
    • Univ of California - Berkeley
    • Physics, University of California, Berkeley

  • Baozhu Lu

    • Physics, Temple University
    • Department of Physics, Temple Univ

  • Manita Rai

    • Physics, Temple University

  • Jason Tran

    • Physics, Temple University

  • Liang Wu

    • Physics, Univ of California - Berkeley
    • Univ of California - Berkeley
    • Physics, University of California, Berkeley

  • Takahiro Morimoto

    • Univ of California - Berkeley
    • Physics, University of California, Berkeley

  • Adolfo Grushin

    • Physics, Univ of California - Berkeley
    • Physics, University of California, Berkeley
    • CNRS, Neel Institute
    • Department of Physics, University of California
    • Institute Neel, CNRS

  • Nityan Nair

    • Physics, University of California, Berkeley
    • Physics, Univ of California - Berkeley
    • Physics, Univeristy of California Berkeley

  • James Analytis

    • University of California Berkeley
    • Physics, UC Berkeley
    • Physics, University of California, Berkeley
    • Univ of California - Berkeley
    • University of California, Berkeley
    • Physics, Univ of California - Berkeley
    • Physics, University of California Berkeley

  • Joel Moore

    • Physics, Univ of California - Berkeley
    • Materials Science Division, Lawrence Berkeley National Laboratory
    • Univ of California - Berkeley
    • Physics, University of California, Berkeley
    • University of California Berkeley and Lawrence Berkeley National Laboratory
    • UC Berkeley

  • Darius Torchinsky

    • Physics, Temple University
    • Department of Physics, Temple Univ

  • Joseph Orenstein

    • Physics, Univ of California - Berkeley
    • Univ of California - Berkeley
    • Physics, University of California, Berkeley