We report the observation, in a III-V semiconductor quantum-well structure, of free excitons with wave function mainly confined inside the barrier material GaAs. The confined-exciton energy falls between the fundamental level of the bulk three-dimensional exciton and its continuum of states. The confinement-energy values, obtained by an ad hoc designed luminescence self-absorption spectroscopy method, are consistent with the barrier parameters.
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Martelli et al. (1993) studied this question.
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