Nonlinear microwave response of clean superconducting films
A. A. Radkevich, A. G. Semenov
DOI 10.1103/PhysRevB.106.094505 · Physical Review B
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Abstract
We develop an explicitly gauge-invariant semiclassical approach to investigate the nonlinear response of superconductors to monochromatic terahertz radiation. We demonstrate that in clean superconductors charge conservation forbids nonlinear 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 the incidence angle of the radiation. Our predictions may be directly verified in experiments with quasi-two-dimensional superconducting films.
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