Correlation-induced superconductivity dynamically stabilized and enhanced by laser irradiation

TL;DR

This paper demonstrates that laser irradiation can dynamically enhance and stabilize superconductivity in correlated electron systems through mechanisms like dynamical localization, avoiding equilibrium inhomogeneities and involving Higgs oscillations.

Contribution

It introduces a novel method of enhancing superconductivity via laser irradiation, leveraging dynamical localization and stabilization without inhomogeneity.

Findings

Superconductivity can be enhanced by laser irradiation in correlated systems.

Dynamical localization increases effective attractive interactions.

Superconductivity is stabilized without equilibrium inhomogeneities.

Abstract

Studies on out-of-equilibrium dynamics have paved a way to realize a new state of matter. Especially, superconductor-like properties above room temperatures recently suggested in copper oxides achieved by selectively exciting vibrational phonon modes by laser have inspired studies on an alternative and general strategy to be pursued for high temperature superconductivity. Here, we show that the superconductivity can be enhanced by irradiating laser to correlated electron systems owing to two mechanisms: First, the effective attractive interaction of carriers is enhanced by the dynamical localization mechanism, which drives the system into strong coupling regions. Secondly, the irradiation allows reaching uniform and enhanced superconductivity dynamically stabilized without deteriorating into equilibrium inhomogeneities that suppress superconductivity. The dynamical superconductivity is subject to the Higgs oscillations during and after the irradiation. Our finding shed light on a way to enhance superconductivity that is inaccessible in equilibrium in strongly correlated electron systems.