Current-induced second harmonic generation in inversion-symmetric Dirac and Weyl semimetals
ORAL
Abstract
Second harmonic generation (SHG) is a fundamental nonlinear optical phenomenon widely used both for experimental probes of materials and for application to optical devices. Even-order nonlinear optical responses including SHG generally require breaking of inversion symmetry, and thus have been utilized to study noncentrosymmetric materials. In this talk, we will talk about our theoretical study of the SHG in inversion-symmetric Dirac and Weyl semimetals under a DC current which breaks the inversion symmetry by creating a nonequilibrium steady state [1]. We find that Dirac and Weyl semimetals exhibit strong SHG upon application of finite current. Our experimental estimation for a Dirac semimetal Cd3As2 and a magnetic Weyl semimetal Co3Sn2S2 suggests that the induced susceptibility χ(2) for practical applied current densities can reach 105 pm V−1 with mid-IR or far-IR light. This value is 100-10000 times larger than those of typical nonlinear optical materials.
[1] KT, T. Morimoto, J. Orenstein, and J. E. Moore, arXiv:2007.08887.
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Presenters
Kazuaki Takasan
University of California, Berkeley, Physics, University of California, Berkeley, Department of Physics, University of California, Berkley, Physical Society of Japan
Authors
Kazuaki Takasan
University of California, Berkeley, Physics, University of California, Berkeley, Department of Physics, University of California, Berkley, Physical Society of Japan
Takahiro Morimoto
University of Tokyo, Department of Applied Physics, The University of Tokyo, The University of Tokyo, Univ of Tokyo
Joseph Orenstein
University of California at Berkeley, University of California, Berkeley, UC Berkeley and Lawrence Berkeley National Lab
Joel Ellis Moore
University of California, Berkeley, Physics, UC Berkeley, Physics, University of California, Berkeley
