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

Numerical simulation of time-resolved light reflection from GaN/AlGaN singl e and multiquantum wells (MQWs) revealed a pronounced vertical motional nar rowing effect. This effect consists in reduction of the inhomogeneous broad ening of the exciton peaks and increase of the decay time of the time-resol ved reflection due to the averaging of the vertical disorder in the structu re by extended exciton-polariton modes. The theory predicts pronounced osci llations in the time-resolved reflection of MQWs resulting from the interfe rence of exciton-polariton modes in the structure. (C) 2000 American Instit ute of Physics. [S0003-6951(00)02019-2].