# Feasible model for photo-induced interband pairing

## TL;DR

This paper shows that photo-induced interband pairing and non-equilibrium superconductivity can occur naturally without fine-tuning, driven by phononic baths and radiative processes, aligning with standard BCS theory.

## Contribution

It demonstrates that non-equilibrium interband superconductivity is a general phenomenon not requiring special parameter tuning, using a simple model with phononic baths.

## Key findings

- Interband pairing arises naturally with phononic baths and radiative recombination.
- Superconductivity can be understood via standard equilibrium BCS theory.
- No fine tuning of parameters is necessary for the phenomenon.

## Abstract

Recently, it has been proposed that a mechanism for the appearance of non-equilibrium superconductivity in a resonantly driven semiconductor with repulsive interband interactions exists.~\cite{Goldstein_PRB15} The underlying microscopic model relies on the appearance of a specific fermionic dissipation mechanism and the careful simultaneous tailoring of the electronic dispersion relation and electron-electron interactions. We, instead, show that the phenomenon is rather general and does not need a special fine tuning of parameters. By considering a pair of bands with locally the same sign of concavity, we demonstrate that interband pairing arises under the natural assumption of the presence of phononic baths and radiative recombination. In light of these findings, we demonstrate how the emergence of superconductivity can be understood in terms of standard equilibrium interband BCS theory.