Bose-Einstein condensation of polaritons at room temperature in a GaAs/AlGaAs structure

TL;DR

This paper demonstrates Bose-Einstein condensation of polaritons at room temperature in a GaAs/AlGaAs structure, showing nonlinear interactions and coherence effects, which could enable room-temperature polariton-based optical devices.

Contribution

First observation of room-temperature polariton Bose-Einstein condensation in a GaAs/AlGaAs structure, highlighting nonlinear interactions and coherence at ambient conditions.

Findings

Nonlinear energy shift of polaritons indicating interactions

Spectral line narrowing demonstrating coherence

Room-temperature polariton condensation achieved

Abstract

We report the canonical properties of Bose-Einstein condensation of polaritons, seen previously in many low-temperature experiments, at room temperature in a GaAs/AlGaAs structure. These effects include a nonlinear energy shift of the polaritons, showing that they are not non-interacting photons, and dramatic line narrowing due to coherence, giving coherent emission with spectral width of 0.24 meV at room temperature with no external stabilization. This opens up the possibility of room temperature nonlinear optical devices based on polariton condensation.