Condensation of Semiconductor Microcavity Exciton Polaritons

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Science  04 Oct 2002:
Vol. 298, Issue 5591, pp. 199-202
DOI: 10.1126/science.1074464

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A phase transition from a classical thermal mixed state to a quantum-mechanical pure state of exciton polaritons is observed in a GaAs multiple quantum-well microcavity from the decrease of the second-order coherence function. Supporting evidence is obtained from the observation of a nonlinear threshold behavior in the pump-intensity dependence of the emission, a polariton-like dispersion relation above threshold, and a decrease of the relaxation time into the lower polariton state. The condensation of microcavity exciton polaritons is confirmed.

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