Motional narrowing and Rayleigh scattering of exciton-polaritons in GaN/AlGaN multiple quantum wells

In this work we present a full semi-classical theory of exciton-polariton effects in disordered Multi-Quantum Wells (MQWs) structures in application to GaN/AlGaN MQWs. Using realistic parameters for the inhomogeneous broadening of the exciton-lines and for the radiative coupling in GaN/AlGaN MQWs, we show that the coherent optical properties of such structures should exhibit pronounced propagation effects in the Resonant Rayleigh Scattering and pronounced Vertical Motional Narrowing effect in the time-resolved reflection. We predict polariton-induced oscillations in the time-resolved coherent optical spectra of GaN/AlGaN MQWs having a period of the order of hundreds of femtoseconds.