Cascade evolution and radiative recombination of quantum dot multiexcitonsstudied by time-resolved spectroscopy

We resolve spatially, spectroscopically, and temporally the photoluminescen ce emission from single self-assembled InAs/GaAs quantum dots. The rich pho toluminescence spectrum and its evolution with time after pulse excitation and with the density of excitation is experimentally measured and analyzed using a theoretical multiexciton model. The model accounts quantitatively f or the dynamics of a small number of interacting electrons and holes confin ed in optically excited semiconductor quantum dots.