Non-equilibrium quasi-condensates in reduced dimensions

TL;DR

This paper presents a phenomenological model for non-equilibrium Bose-Einstein condensates in reduced dimensions, providing analytic predictions for fluctuations and coherence, and compares them with experimental data.

Contribution

It introduces a new generic model for non-equilibrium condensates and derives analytic expressions for key properties across different dimensions.

Findings

Analytic momentum distribution expressions

Predictions for spatial coherence behavior

Good agreement with experimental data

Abstract

We develop a generic phenomenological model to describe the fluctuations on top of a non-equilibrium Bose-Einstein condensate. Analytic expressions are obtained for the momentum distribution of the non-condensed cloud and for the long-distance behavior of the spatial coherence in the different dimensionalities. Comparison of our predictions with available experimental data on condensates of exciton-polaritons and on surface-emitting planar laser devices is finally made.