Nardin, GaëlLagoudakis, Konstantinos G.Wouters, MichielRichard, MaximeBaas, AugustinAndré, RégisDang, Le SiPietka, BarbaraDeveaud-Plédran, Benoît2009-12-162009-12-162009-12-16200910.1103/PhysRevLett.103.256402https://infoscience.epfl.ch/handle/20.500.14299/44869WOS:000272958300027We report on time-resolved measurements of the first order spatial coherence in an exciton-polariton Bose-Einstein condensate. Long-range spatial coherence is found to set in right at the onset of stimulated scattering, on a picosecond time scale. The coherence reaches its maximum value after the population and decays slowly, staying up to a few hundred picoseconds. This behavior can be qualitatively reproduced, using a stochastic classical field model describing interaction between the polariton condensate and the exciton reservoir within a disordered potential. ©2009 The American Physical SocietyExcitonsPolaritonsBose-Einstein CondensationTime-Resolved spectroscopyPhotoluminescenceNon-equilibriumSolid state dynamicsSemiconductor microcavitiestext::journal::journal article::research article