Abstract
Many-body effects on the exciton spectra of self-organized InAs/GaAs quantum dots (QD’s) are investigated in high-density photoluminescence experiments. Opposite renormalization of the ground- and excited-state transition energies is observed with increasing exciton occupation of the QD’s. The ground-state transition energy decreases by ∼16 meV whereas the excited-state transition energies increase up to ∼26 meV for an average occupation with 18 excitons corresponding to a volume density of The shrinkage of the ground-state transition energy normalized to the exciton binding energy is significantly smaller than band-gap renormalization in higher dimensional systems supporting the strong confinement in the self-organized InAs/GaAs QD’s.
- Received 16 June 2000
DOI:https://doi.org/10.1103/PhysRevB.62.16881
©2000 American Physical Society