Photoluminescence kinetics of statistically degenerate quantum well excitons

The dynamics of resonant photoluminescence (PL) of quantum well (QW) excito ns is studied with in the thermodynamic description of the LA-phonon-assist ed relaxation kinetics, taking into account Bose-Einstein statistics of exc itons. Nonclassical statistics strongly influences the effective radiative lifetime tau(opt) of quasi-equilibrium QW excitons. For a strongly degenera te gas of excitons, the law tau(opt) proportional to T (T is the effective temperature of excitons) changes and tau(opt) approaches 2 tau(R), where ta u(R) is the intrinsic radiative lifetime of QW excitons. Our approach descr ibes self-consistently both the rise of PL. due to thermalization, and the decay of FL, due to the radiative recombination of thermalized QW excitons. Finally, we model numerically the PL kinetics of statistically-degenerate indirect excitons in coupled GaAs/AlGaAs quantum wells.