Spin-orbit coupled cold exciton condensates

TL;DR

This paper provides a theoretical analysis of the dynamics of cold indirect exciton condensates, highlighting how spin-orbit interactions and non-linear effects influence their behavior in space and time.

Contribution

It introduces a comprehensive model including Rashba and Dresselhaus spin-orbit effects and non-linear exciton interactions, revealing their impact on exciton droplet dynamics.

Findings

Spin-orbit interactions cause qualitative changes in exciton droplet behavior.

Non-linear exciton interactions transform bright into dark excitons.

Theoretical predictions suggest new dynamical regimes for cold exciton condensates.

Abstract

We analyze theoretically the dynamics of degenerate condensate of cold indirect excitons. We account for both linear spin dependent terms arising from spin-orbit interaction of Rashba and Dresselhaus types and non-linear terms transforming a pair of bright excitons into a pair of dark ones. We show that both terms should lead to the qualitative changes in the dynamics of cold exciton droplets in the real space and time.