# 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.

## Key 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.

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Source: https://tomesphere.com/paper/0907.3657