Programme

O.5 -- Oral, ANSWCCMS-2023

Date: Friday, 10 November 2023

Time: 11:30 - 12:00

Photoinduced Supercurrent Hall effect in 2D Superconductors

Anton Parafilo

Center for Theoretical Physics of Complex Systems, Institute for Basic Science, Daejeon, Korea

Absorption of electromagnetic (EM) waves is a powerful experimental technique for studying the electrical and optical properties of superconducting materials. The first works on the theory of EM response in superconductors appeared immediately after the BCS theory [1]. It was shown that the absorption of a uniform EM field is forbidden by specific selection rule in pure superconductors. Finite absorption at frequencies of EM field larger than doubled value of superconducting gap takes place if electron scattering on impurities is accounted. Recently [2, 3], the question of EM response in isotropic superconductors with built-in supercurrent was addressed. Again, the absorption is forbidden in impurity-free samples due to the Galilean invariance. In this talk, we investigate the nonlinear photo-response of isotropic 2D superconductors in the presence of built-in supercurrent at low temperatures. It is assumed that the Galilean invariance is broken due to point-like impurities. The appearance of the photoinduced quasiparticle current flowing in the direction perpendicular to the built-in supercurrent in case of circularly polarized EM field is predicted. The condition of the absence of electric field inside the superconducting sample (in the stationary regime) results in the appearance of a supercurrent perpendicular to the initially built-in supercurrent, which compensates the photoinduced quasiparticle current flow. As the consequence, the absorption of the circularly-polarized EM field leads to the supercurrent Hall-like response in 2D superconductor.

Presenter: Anton Parafilo

Presentation file: