Abstract
We have investigated the evolution of exciton state filling as a function of excitation power density in InAs∕GaAs quantum dots (QDs). In addition to the emission bands of exciton recombination corresponding to the atom-like S, P, and D, etc. shells of quantum dots, it was observed that some extra states, P′ (between the S and P shells) and D′ (between the P and D shells), appear in the spectra with increasing number of excitons occupying the QDs. The emergence of these intershell excitonic levels is an experimental demonstration of strong exciton–exciton exchange interaction and coupling as well as state mixing and hybridization of a multiexciton system in quantum dots.
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