SUPPRESSED POLARITON SCATTERING IN SEMICONDUCTOR MICROCAVITIES

Ultrafast time-resolved measurements on a semiconductor microcavity di stinguish polariton dynamics dependent on the detuning between the con stituent photon and exciton modes. Spectral synthesis allows the injec tion of specific polariton pulses into the sample. Scattering which re sults in absorption is found to be suppressed in the lower polariton b ranch by the combined action of normal mode splitting and motional nar rowing. The experimental difference between angle and position tuning demonstrates the role of the polariton dispersion in polariton-polarit on interactions.