Dynamics of long-range ordering in an exciton-polariton condensateDynamics of long-range ordering in an exciton-polariton condensate
Faculty of Sciences. Physics
Theory of quantum systems and complex systems
2009New York, N.Y., 2009
Physical review letters. - New York, N.Y.
103(2009):25, 4 p.
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.