Parametric luminescence of microcavity polaritons - art. no. 041303

Tilt: spectral and dispersive emission properties are analytically determin ed for the two-dimensional system of exciton-polaritons in microcavities ex cited by a resonant and coherent optical pump. New collective excitations r esult from the anomalous coupling between one generic polariton state and i ts idler, created by the scattering of two pumped polaritons. The correspon ding parametric correlation is stimulated by the emitter and idler populati ons and drives very efficiently the luminescence. The intrinsic properties of the collective excitations determine a peculiar emission pattern.