Spontaneous Polarisation Build up in a Room Temperature Polariton Laser

Abstract

We observe the build up of strong (~50%) spontaneous vector polarisation in emission from a GaN-based polariton laser excited by short optical pulses at room temperature. The Stokes vector of emitted light changes its orientation randomly from one excitation pulse to another, so that the time-integrated polarisation remains zero. This behaviour is completely different to any previous laser. We interpret this observation in terms of the spontaneous symmetry breaking in a Bose-Einstein condensate of exciton-polaritons.

References in corpus (2)

• Polariton laser using single micropillar GaAs-GaAlAs semiconductor cavities
• Photon lasing in a GaAs microcavity: similarities with a polariton condensate

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