Mean field study of 2D quasiparticle condensate formation in presence of strong decay

TL;DR

This paper develops a mean-field theoretical framework to understand 2D quasiparticle condensate formation considering decay, revealing a bistability region and applying the model to exciton-polariton systems in microcavities.

Contribution

The paper introduces a microscopic mean-field model using Schwinger-Keldysh formalism to describe quasiparticle condensates with decay, including phase diagram analysis and application to exciton-polaritons.

Findings

Identification of a bistability region in the phase diagram.

Derivation of dynamical equations for quasiparticle condensates.

Application to 2D exciton-polariton systems in CdTe microcavities.

Abstract

Bose-condensation in a system of 2D quasiparticles is considered in the scope of a microscopic model. Mean-field dynamical equations are derived with the help of the Schwinger-Keldysh formalism and a simple model is proposed which allows to describe key features of condensate formation in systems with various quasiparticle decay rates. By analysing stationary solutions of this equation, we obtain the phase diagram of quasiparticle gas, finding a bistability region in the parameter space of the system. Finally, as an application of our theory, we study the phase diagram of a 2D exciton-polariton system in CdTe microcavity.