Second Harmonic Dipoles in Chiral Wide-Gap Insulator Models

ORAL

Abstract



Thin wide-gap chiral insulators are candidate materials for non-linear nano-optics devices, such as emitters or reflectors. They can be realized by the relative twist of thin flakes of Van der Waals materials, like hexagonal Boron Nitride (hBN). We calculate the Second Harmonic Polarization (SHP) response of twisted few-layer flake models. Our results illustrate that the insulators are well described by a decoupled flake limit for driving frequencies below half the electronic gap. We discuss the influence of the nonlinear polarization sources on Second Harmonic Generation (SHG) from reflection.

*This work is supported by the Department of Energy, Basic Energy Sciences, Pro-QM EFRC (DE- SC0019443). This work used the Bridges system, which is supported by NSF award number ACI-1445606, at the Pittsburgh Supercomputing Center (PSC).

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Presenters

  • Andrew Smith

    • Carnegie Mellon University

Authors

  • Andrew Smith

    • Carnegie Mellon University

  • Chong Wang

    • Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA
    • Carnegie Mellon Univ
    • University of Washington
    • University of Washington, Seattle
    • Carnegie Mellon University

  • Di Xiao

    • University of Washington
    • Department of Physics, University of Washington, Seattle, WA, USA. Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA
    • University of Washington, Seattle