Kavokin, A.V. (2008) Spontaneous polarization buildup in a room-temperature polariton laser. Physical Review Letters, 101 (13), 136409-[4 pages]. (doi:10.1103/PhysRevLett.101.136409).
Abstract
We observe the buildup of strong (?50%) spontaneous vector polarization in emission from a GaNbased
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
polarization remains zero. This behavior is completely different from any previous laser. We interpret this
observation in terms of the spontaneous symmetry breaking in a Bose-Einstein condensate of exciton
polaritons.
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