Self-organization of multiple polariton-polariton scattering in semiconductor microcavities

Sharp transformations of polariton-polariton scattering patterns in a semiconductor microcavity with an increase in pump intensity are observed. These transformations are manifestations of nonequilibrium first-order phase transitions in a strongly driven multimode Bose system. The effect arises from the interplay between the bistability of the pumped polariton mode and the parametric instability in the nonlinear polariton system.