State-filling and renormalization in charged InGaAs/GaAs quantum dots

Few-particle effects have been studied for charged InGaAs/GaAs quantum dots (QDs) by means of size-selective photoluminescence excitation spectroscopy (PLE). The effects of spectator electrons on the electronic properties, in particular exciton transitions in the near infrared spectral region, are investigated. The characteristic quenching of excitation channels due to state-filling with increasing charging allows to identify excited exciton transitions and to correlate the observed renormalization of the transition energies to the QD population.