Elementary excitations in spinor polariton- electron systems

TL;DR

This paper investigates the spin-dependent elementary excitations in a 2D hybrid polariton-electron system, revealing unusual dispersion behaviors, including roton minima and condensate destruction due to exchange interactions.

Contribution

It introduces a detailed analysis of spin effects in polariton-electron interactions and predicts novel dispersion phenomena like roton minima and condensate instability.

Findings

Spin-dependent dispersion due to exchange interactions

Appearance of roton minima in the excitation spectrum

Potential condensate destruction in coupled quantum wells

Abstract

We consider effective interactions in a 2D hybrid polariton- electron system and calculate dispersion of elementary excitations accounting the spin degree of freedom of the particles. Due to the crucial role played by the exchange term in polariton- electron interactions the dispersions of this system become spin- dependent and show unusual behavior. The coupling of the excitations of the condensate with 2D plasmon can result in appearence of roton minimum in the dispersion and destruction of the condensate for close enough situated quantum wells with electrons and excitons.