Photoluminescence Kinetics of Statistically Degenerate Quantum Well Excitons

The dynamics of resonant photoluminescence (PL) of quantum well (QW) excitons is studied within the thermodynamic description of LA-phonon-assisted relaxation kinetics, taking into account Bose-Einstein statistics of excitons. Nonclassical statistics strongly influences the effective radiative life-time tau sub (opt) of quasi-equilibrium QW excitons. For a strongly degenerate gas of excitons, the law tau sub (opt) alpha T (T is the effective temperature of excitons) changes and tau sub (opt) approaches 2 tau sub R, where tau sub R is the intrinsic radiative lifetime of QW excitons. Our approach describes self-consistently both the rise of PL, due to thermalization, and the decay of PL, 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.