Spectrum and thermal fluctuations of a microcavity polariton Bose-Einstein condensate

TL;DR

This paper develops a Hartree-Fock-Popov theoretical framework to describe the spectrum, fluctuations, and phase diagram of microcavity polariton Bose-Einstein condensates, aligning with recent experimental results.

Contribution

It introduces a self-consistent model incorporating exciton-photon coupling and non-linearity for polariton BECs, advancing theoretical understanding.

Findings

Quantitative predictions match experimental observations

Describes collective excitation spectrum and energy shifts

Provides phase diagram for polariton condensates

Abstract

The Hartree-Fock-Popov theory of interacting Bose particles is developed, for modeling exciton-polaritons in semiconductor microcavities undergoing Bose-Einstein condensation. A self-consistent treatment of the linear exciton-photon coupling and of the exciton non-linearity provides a thermal equilibrium description of the collective excitation spectrum, of the polariton energy shifts and of the phase diagram. Quantitative predictions support recent experimental findings.