Floquet engineering triplet superconductivity in superconductors with spin-orbit coupling or altermagnetism

TL;DR

This paper explores how light irradiation can induce and control triplet superconductivity in materials with spin-orbit coupling or altermagnetism using Floquet engineering, revealing new pathways for optically manipulating superconducting states.

Contribution

It demonstrates the theoretical possibility of optically generating and controlling triplet superconductivity in specific superconductors through Floquet-Magnus expansion analysis.

Findings

Triplet superconductivity can be induced in spin-singlet superconductors with spin-orbit coupling.

Nonunitary triplet superconductivity can emerge in altermagnetic superconductors.

Optical methods can dynamically generate and manipulate triplet pairing states.

Abstract

We study superconductivitiy under light irradiation based on the Floquet-Magnus expansion in the high-frequency regime. We find that, in spin-singlet superconductors with spin-orbit coupling, triplet superconductivity can be induced in the first-order perturbation for dynamical gap functions and the second-order perturbation for static gap functions. We also show that, in unitary triplet superconductors with altermagnetism, nonunitary triplet superconductivity can emerge in the firstorder perturbation for dynamical gap function and in the second-order perturbation for static gap functions. These results indicate optical generation and control of triplet superconductivity.