This article is cited in 5 papers

CONDENSED MATTER

Contribution of fluctuations of the order parameter to the second harmonic generation in two-dimensional monomolecular superconductors

M. V. Boev^ab, V. M. Kovalev<sup>b

a</sup> Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
^b Novosibirsk State Technical University, Novosibirsk, 630073 Russia

Abstract: A theory of second harmonic generation in a two-dimensional superconductor in the fluctuation temperature regime has been developed within an approach based on the time-dependent Ginzburg–Landau equation. Expressions for the electric current that is induced by fluctuations of the order parameter and oscillates at the double frequency of the incident electromagnetic wave have been obtained. It has been shown that the effect has a significant singularity in temperature: the kinetic coefficients describing the second harmonic generation are inversely proportional to the square of the reduced temperature. The magnitude of the effect estimated for the two-dimensional superconductor based on a monomolecular molybdenum disulfide layer demonstrates the possibility of the experimental verification of the theory.

Received: 13.05.2022
Revised: 22.06.2022
Accepted: 22.06.2022

DOI: 10.31857/S1234567822150071

 English version: Journal of Experimental and Theoretical Physics Letters, 2022, 116:3, 173–178