Abstract
We study the optical-phonon emission-cascade in ZnCdTe quantum wells governing the energy relaxation of electron-hole pairs towards self-organized CdTe/ZnTe islands, which become selectively populated. Using photoluminescence excitation spectroscopy, we determine the energy of the phonons involved in the process. We evidence moreover coupled exciton-phonon states in the quantum dots which explain the trapping of the electron-hole pairs and their recombination. Using a time-resolved pump and probe technique, we measure the variations of the absorption and transmission spectra. We thus determine the population relaxation dynamics of the selected quantum dots. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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