Coherent photogalvanic effect in fluctuating superconductors

V. M. Kovalev, K. Sonowal, I. G. Savenko

Research output: Contribution to journalArticlepeer-review

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We develop a theory of the coherent photogalvanic effect (CPGE) in low-dimensional superconductors in the fluctuating regime. It manifests itself in the appearance of a stationary electric current of Cooper pairs under the action of two coherent electromagnetic fields of light with frequencies lying in the sub-terahertz range. We derive the general formula for the electric current density, study the particular cases of linear and circular polarizations of the external light fields, and show that the current might have a nonmonotonous spectrum at certain polarization angles and turns out very sensitive to the proximity of the ambient temperature to the critical temperature of superconducting transition: Approaching the critical temperature, the peak in the spectrum becomes narrower, its frequency experiences a redshift, and the intensity of the peak drastically grows.

Original languageEnglish
Article number024513
JournalPhysical Review B
Issue number2
StatePublished - 15 Jan 2021
Externally publishedYes


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