This Letter reports experimental evidence for the existence of localized excitons at above-barrier energies in type-I superlattices. By using magnetoabsorption measurement on a series of Zn0.86{Cd}0.14$Se/${Zn}0.75Mn0.25Se superlattices, where the subbands localized in nonmagnetic and magnetic layers undergo drastically different Zeeman splittings, we show conclusively that above-barrier excitons are localized in the barrier rather than in the well regions.
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Zhang et al. (1992) studied this question.
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