2020/07/09 by V. M. Kovalev, K. Sonowal, I. G. Savenko
Engineering · Physics and Astronomy · #Condensed matter physics #Mechanical and Optical Resonators #Photonic and Optical Devices #Photorefractive and Nonlinear Optics #Physics #Superconductivity #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.103.024513
published as Phys. Rev. B 103, 024513 (2021) · 5 pages, 4 figures
arxiv created 2020/07/09 · openalex publication_date 2021/01/15 · arxiv updated 2021/01/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.