Long range correlations in a 97% excitonic one-dimensional polariton condensate

TL;DR

This study demonstrates a long-range, out-of-equilibrium excitonic polariton condensate in a one-dimensional system, exhibiting macroscopic coherence over 10 microns despite a low photonic component.

Contribution

It reports the realization of a predominantly excitonic polariton condensate with long-range coherence, supported by a driven-dissipative model explaining the limited correlation length.

Findings

Macroscopic occupation of a 3% photonic polariton mode

First-order coherence observed over 10 microns

Correlation length limited by shallow disorder effects

Abstract

We report on the realization of an out-of-equilibrium polariton condensate under pulsed excitation in a one-dimensional geometry. We observe macroscopic occupation of a polaritonic mode with only 3% photonic fraction, and a nature strikingly close to that of a bare exciton condensate. With the help of this tiny photonic fraction, the condensate is found to display first-order coherence over distances as large as 10 microns. Based on a driven-dissipative mean field model, we find that the correlations length is limited by the effects of a shallow disorder under non-equilibrium conditions.