title: Dynamics of long-range ordering in an exciton-polariton condensate.
abstract: We 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.
authors.affiliation: IPEQ, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, 1015 Lausanne, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Nardin
authors.forename: K G
authors.initials: KG
authors.lastname: Lagoudakis
authors.forename: M
authors.initials: M
authors.lastname: Wouters
authors.forename: M
authors.initials: M
authors.lastname: Richard
authors.forename: A
authors.initials: A
authors.lastname: Baas
authors.forename: R
authors.initials: R
authors.lastname: André
authors.forename: Le Si
authors.initials: le S
authors.lastname: Dang
authors.forename: B
authors.initials: B
authors.lastname: Pietka
authors.forename: B
authors.initials: B
authors.lastname: Deveaud-Plédran