Spontaneous symmetry breaking in a polariton and photon laser

Details Spontaneous symmetry breaking in a polariton and photon laser Spontaneous symmetry breaking in a polariton and photon laser

2012-04-26

arxiv.org/abs/1204.5969v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Here we report on the spontaneous formation of polarisation and coherence in an exciton-polariton condensate in a planar GaAs quantum-well microcavity under pulsed excitation. We have measured the Stokes vector of light emitted by the polariton condensate after each excitation pulse. These single-shot measurements evidenced the build-up of stochastic polarisation with the Stokes vector changing randomly from pulse to pulse. Below threshold the polarisation noise does not exceed 10%, while above threshold we observe a total polarisation of about 50% after each excitation pulse, while the polarisation averaged over the ensemble of pulses remains nearly zero. The stochastic po- larisation build-up is accompanied by the build-up of spatial coherence of the condensate, evidenced by spatial interferometry measurements. The formation of a stochastic spinor order parameter of the condensate is observed both in strong and similarity between polariton and photon lasers.

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