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Coherent photogalvanic effect in fluctuating superconductors

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Title
Coherent photogalvanic effect in fluctuating superconductors
Author(s)
Kovalev, V. M.; K. Sonowal; Savenko, Ivan
Publication Date
2021-01
Journal
PHYSICAL REVIEW B, v.103, no.2, pp.1 - 7
Publisher
AMER PHYSICAL SOC
Abstract
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.
URI
https://pr.ibs.re.kr/handle/8788114/9277
DOI
10.1103/PhysRevB.103.024513
ISSN
2469-9950
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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