Stochastic polarization formation in exciton-polariton Bose-Einstein condensates

TL;DR

This paper theoretically investigates how exciton-polariton Bose-Einstein condensates spontaneously develop stochastic polarization under pulsed excitation, linking coherence properties to polarization distribution and analyzing dephasing mechanisms.

Contribution

It introduces a theoretical model explaining stochastic polarization formation in exciton-polariton condensates and connects polarization behavior with coherence and relaxation processes.

Findings

Below threshold, polarization is near zero.

Above threshold, polarization has a random orientation.

Polarization dephasing and relaxation mechanisms are analyzed.

Abstract

We demonstrate theoretically the spontaneous formation of a stochastic polarization in exciton-polariton Bose-Einstein condensates in planar microcavities under pulsed excitation. Below the threshold pumping intensity (dependent on the polariton life-time) the average polarization degree is close to zero, whilst above threshold the condensate acquires a polarization described by a (pseudospin) vector with random orientation, in general. We establish the link between second order coherence of the polariton condensate and the distribution function of its polarization. We examine also the mechanisms of polarization dephasing and relaxation.