Nonlinear microwave response of clean superconducting films

Abstract

We develop an explicitly gauge-invariant semiclassical approach to investigate nonlinear response of superconductors to monochromatic THz radiation. We demonstrate that in clean superconductors charge conservation forbids non-linear response to a uniform field. We apply our approach to quasi-two-dimensional films and obtain an explicit expression for the photoinduced current. We find that the photoinduced current exhibits a strong dependence on polarization and incidence angle of the radiation. Our predictions may be directly verified in experiments with quasi-two-dimensional superconducting films.

arXiv comment11 pages, 2 figures

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• Enhanced nonlinear Hall effect by Cooper pairs near superconductor criticality
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• Photogalvanic and photon drag phenomena in superconductors and hybrid superconducting systems
• Ratchet Hall Effect in Fluctuating Superconductors
• Vertex corrections to nonlinear photoinduced currents in 2D superconductors