Programme

P.5 -- Poster, ANSWCCMS-2023

Date: Tuesday, 7 November 2023

Time: 13:00 - 14:30

Second harmonic generation in fluctuating Ising superconductors

Kabyashree Sonowal

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

We investigate the second-harmonic generation (SHG) effect in a two-dimensional noncentrosymmetric transition metal dichalcogenide Ising superconductor in the fluctuating regime under the action of a uniform external electromagnetic field. There emerge two contributions to this effect, one conventional, which is due to the electron gas in its normal state, and the other one is of the Aslamazov–Larkin nature. Namely, it originates from the presence of fluctuating Cooper pairs in the system when the temperature approaches the temperature of the superconducting transition in the sample from above. Employing a usual approach to Ising superconductors, we lift the valley degeneracy by application of a weak out-of-plane external magnetic field, which produces a Zeeman effect. In calculations, we use the Boltzmann equations approach for the electron gas in the normal state and the time-dependent Ginzburg–Landau equations for the fluctuating Cooper pairs and show the emergence of SHG electric current characterized by a temperature-dependent broadening and a redshift.

Presenter: Kabyashree Sonowal