Multistability of cavity exciton-polaritons affected by the thermally generated exciton reservoir

TL;DR

This paper investigates how thermally generated exciton reservoirs influence the multistability of cavity exciton-polaritons, revealing their role in energy shifts and interaction anisotropy in microcavities with small Rabi splitting.

Contribution

It demonstrates the significant impact of thermally populated exciton reservoirs on polariton multistability and interaction properties, a factor previously neglected in such systems.

Findings

Exciton reservoir can be efficiently populated by polariton-phonon scattering in small Rabi splitting cavities.

The reservoir reduces the spin anisotropy of polariton-polariton interactions.

Presence of the reservoir affects the energy shifts and multistability behavior of cavity polaritons.

Abstract

Until now, the generation of an excitonic reservoir in a cavity polariton system under quasi-resonant pumping has always been neglected. We show that in microcavities having a small Rabi splitting (typically GaAs cavities with a single quantum well), this reservoir can be efficiently populated by polariton-phonon scattering. We consider the influence of the exciton reservoir on the energy shifts of the resonantly pumped polariton modes. We show that the presence of this reservoir effectively reduces the spin anisotropy of the polariton-polariton interaction, in agreement with recent experimental measurements, where the multistability of cavity polaritons has been analyzed