Optical orientation of the homogeneous non-equilibrium Bose-Einstein condensate of bright excitons (polaritons)

TL;DR

This paper presents a simple model explaining spin dynamics, optical orientation, and polarization effects in a non-equilibrium Bose-Einstein condensate of exciton polaritons, revealing mechanisms for spin splitting suppression and polarization conversion.

Contribution

It introduces a novel model for the pseudospin dynamics of non-equilibrium polariton condensates, elucidating optical orientation and polarization phenomena.

Findings

Suppression of spin splitting in magnetic fields

Optical alignment and conversion to orientation

Spontaneous circular polarization and enhanced spin splitting without external field

Abstract

A simple model, describing the dynamics of the non-equilibrium pseudospin of a homogeneous Bose-Einstein condensate of exciton polaritons, has been formulated. It explains the suppression of spin splitting of a non-equilibrium polariton condensate in an external magnetic field, the optical alignment, and the conversion of alignment into orientation of polaritons. It has been shown that inverse effects are possible, to wit, the spontaneous circular polarization and the enhancement of spin splitting of a non-equilibrium condensate of polaritons in the absence of external field.