Noise-induced transition from superfluid to vortex state in two-dimensional nonequilibrium polariton condensates

TL;DR

This paper investigates how noise induces a transition from superfluid to vortex states in two-dimensional nonequilibrium polariton condensates, focusing on vortex-antivortex pair formation via the Berezinskii-Kosterlitz-Thouless mechanism.

Contribution

It provides a numerical analysis of the critical noise for vortex pair creation in driven-dissipative polariton condensates, considering nonequilibrium and relaxation effects.

Findings

Critical noise threshold depends on system parameters.

Vortex-antivortex pairs form via BKT mechanism under noise.

Energy relaxation influences vortex formation dynamics.

Abstract

We study the Berezinskii-Kosterlitz-Thouless mechanism for vortex-antivortex pair formation in two-dimensional superfluids for nonequilibrium condensates. Our numerical study is based on a classical field model for driven-dissipative quantum fluids that is applicable to polariton condensates. We investigate the critical noise needed to create vortex-antivortex pairs in the systems, starting from a state with uniform phase. The dependence of the critical noise on the nonequilibrium and energy relaxation parameters is analyzed in detail.