Abstract
We report on optical studies of excitonic transfer and localization in a CdSe/ZnSe fractional monolayer superlattice with an embedded deeper ZnCdSe quantum well (QW). Time-resolved selective excitation photoluminescence measurements reveal a two-step nature of the energy relaxation process. The first stage includes hot-exciton cascade relaxation assisted by emission of ZnSe LO phonons, which results in the formation of a narrow nonthermal distribution of free excitons. Different mechanisms compete to destroy the distribution, including optical- and acoustic-phonon-assisted exciton localization by fluctuations of the random potential, as well as tunneling escape of hot free excitons towards the embedded deeper QW in the sample.
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