# Long-lived non-equilibrium superconductivity in a non-centrosymmetric Rashba semiconductor

## TL;DR

This study uncovers long-lived non-equilibrium superconducting states in Rashba semiconductor GeTe, revealing asymmetric magnetoresponse and slow dynamics that challenge conventional understanding of superconductivity in non-centrosymmetric materials.

## Contribution

It demonstrates the existence of long-lived non-equilibrium superconductivity and develops a model explaining slow relaxation dynamics in Rashba systems.

## Key findings

- Non-equilibrium states decay on timescales much longer than electronic scattering times.
- The magnetoresponse is asymmetric under magnetic field reversal.
- Evidence of slow dynamics in another Rashba system.

## Abstract

We report non-equilibrium magnetodynamics in the Rashba-superconductor GeTe, which lacks inversion symmetry in the bulk. We find that at low temperature the system exhibits a non-equilibrium state, which decays on time scales that exceed conventional electronic scattering times by many orders of magnitude. This reveals a non-equilibrium magnetoresponse that is asymmetric under magnetic field reversal and, strikingly, induces a non-equilibrium superconducting state distinct from the equilibrium one. We develop a model of a Rashba system where non-equilibrium configurations relax on a finite timescale which captures the qualitative features of the data. We also obtain evidence for the slow dynamics in another non-superconducting Rashba system. Our work provides novel insights into the dynamics of non-centrosymmetric superconductors and Rashba systems in general.