Real-space microscopic description of laser-pulse induced melting of superconductivity

TL;DR

This paper presents a microscopic real-space model to simulate laser-induced melting of superconductivity, reproducing experimental phenomena and predicting novel current behaviors post-pulse.

Contribution

It introduces a real-space microscopic approach to model superconductor dynamics under laser pulses, capturing spatial-temporal behaviors and predicting unusual current flows.

Findings

Reproduces critical slowing-down near the melting transition.

Predicts backward wave-like current flows after pulse.

Provides spatially resolved insights into phase fluctuations.

Abstract

Quenching quantum order via laser pulses has proven a useful tool to access exotic physical effects in systems that are strongly perturbed out of equilibrium. However, theoretical modelling of experimental measurements is typically done phenomenologically or by assuming translational invariance due to the complexity of the problem. Here, we solve a microscopic real-space model of the time dynamics of a superconductor following an intense laser-pulse. We are able to reproduce recent experimental findings displaying a critical slowing-down of the melting of the order parameter for laser fluences close to the condensation energy. Moreover, we leverage the real-space resolution of our model to predict how phase fluctuations and currents in the system behave both spatially and temporally. We discover an unusual current flow in the superconductor after the pulse has subsided, resembling backward waves that normally require special engineering in metamaterials or wave guides. Our results predict a rich behavior of the superconducting order parameter at a microscopic level which is manifested in current textures that can be probed using radiation detection.