Ground-state polariton condensation in 2D-GaAs semiconductor microcavities

TL;DR

This paper reports the observation of ground-state polariton condensation in 2D GaAs microcavities, demonstrating the formation of a coherent polariton state and a transition from weak to strong coupling under pulsed excitation.

Contribution

It provides experimental evidence of polariton condensation in 2D GaAs microcavities and analyzes the dynamics of coherence and coupling regimes.

Findings

Observation of polariton condensation at ground state

Transition from weak to strong coupling in time domain

Coherent polariton state formation

Abstract

We observe ground-state polariton condensation in a two dimensional GaAs/AlAs semiconductor microcavity under non resonant pulsed optical excitation. We resolve the formation of a polariton condensate by studying the spatial, angular, coherence, energy and transient dynamics of polariton photoluminescence. For high excitation densities we also observe a transition from the weak- to the strong-coupling regime in the time-domain and resolve the build-up of a coherent polariton state.