V. V. Belykh, N. N. Sibeldin, V. D. Kulakovskii, M. M. Glazov, M. A. Semina, C. Schneider, S. Hofling, M. Kamp, A. Forchel
The dynamics of the first order spatial coherence, g(1), for a polariton system in a high-Q GaAs microcavity was investigated on the basis of Young's double slit experiment under 3 ps pulse excitation at the conditions of polariton Bose-Einstein condensation. It was found that in the process of condensate formation, the coherence buildup time increases almost linearly with the distance indicating that the coherence expands with almost constant velocity of about 10^8 cm/s. The coherence is strongly affected by exciton reservoir and polariton decay kinetics. It is smaller than coherence in thermally equilibrium system during the growth of condensate density and well exceeds it at the end of condensate decay.
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http://arxiv.org/abs/1210.6906
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