Vertical motional narrowing of exciton-polaritons in GaN based quantum wells

Numerical simulation of time-resolved light reflection from GaN/AlGaN single and multi-quantum wells (MQWs) revealed a pronounced vertical motional narrowing effect. This effect consists in reduction of the inhomogeneous broadening of the exciton peaks and increase of the decay-time of the time-resolved reflection due to the averaging of the vertical disorder in the structure by extended exciton–polariton modes. The theory predicts pronounced oscillations in the time-resolved reflection of MQWs resulting from the interference of exciton–polariton modes in the structure.