Light induced magnetization in d-wave superconductors

TL;DR

This paper develops a microscopic theory explaining how light can induce magnetization in d-wave superconductors through nonlinear effects, with potential experimental applications.

Contribution

It introduces an extended Keldysh-Nambu formalism to quantify light-induced magnetization in d-wave superconductors, highlighting the role of branch population imbalance.

Findings

Calculated the magnitude of induced current and static magnetization.

Demonstrated the role of nonlinear and nonlocal effects in the response.

Discussed experimental implications and future research directions.

Abstract

We develop a microscopic theory of the inverse Faraday effect in d-wave superconductors. An extended version of the Keldysh-Nambu quasiclassical formalism is used to compute the dc-component of the current density induced by an external monochromatic radiation. Our work explicitly demonstrates how branch population imbalance produces nonvanishing nonlinear and nonlocal dc-response. We evaluate the magnitude of the induced current and obtain estimates for the induced static magnetization. Experimental implications of our theory and future extensions of our work are briefly discussed.