Collective excitations and divergent spin currents in non-centrosymmetric superconductors

TL;DR

This paper investigates how laser irradiation influences collective excitations and spin currents in non-centrosymmetric superconductors with Rashba spin-orbit coupling, revealing resonant enhancements in harmonic responses.

Contribution

It introduces a theory explaining resonant spin current enhancements without interband transitions, supported by numerical simulations including interband effects.

Findings

Resonant enhancement of third harmonic response due to laser driving

Resonant enhancement of second harmonic spin current response

Numerical simulations clarify collective mode signatures in superconductor dynamics

Abstract

We study the collective modes in a non-centrosymmetric superconductor with Rashba spin-orbit coupling under laser irradiation. The concept of Anderson Pseudospin Resonance allows to reveal how laser driving gives rise not only to the established resonant enhancement of the third harmonic response, but also to a resonant enhancement in the second harmonic response of the spin current. We propose a theory which explains the phenomenon without including interband transitions. The theory is corroborated by numerical simulations which incorporate interband effects and allow us to clarify the signatures of the collective modes in the long-time dynamics of the superconductor.