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Optical studies of type-II ZnTe/Cd 1− x Mn x Se superlattices show two types of interband transitions: (i) radiative type-II transitions between electrons confined in the Cd 1− x Mn x Se and holes confined in the ZnTe layers, and (ii) strongly absorptive type-I transitions associated with the formation of novel excitons involving confined electrons and above-barrier holes, both of which are localized in the Cd 1− x Mn x Se layers. The spatial localization of the states participating in both types of transitions is identified by magneto-optical spectroscopy.
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Luo et al. (1993) studied this question.
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