In the InxGa1−xAs-GaAs coupled double quantum well system the free exciton in the GaAs barrier is directly coupled to the symmetric heavy-hole free exciton in the quantum well. In contrast the free exciton in the barrier does not couple to the symmetric light-hole free exciton in the quantum well, or to Landau levels associated with the lowest energy conduction and valence subband levels. These results are explained by momentum conservation rules.
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Reynolds et al. (1993) studied this question.
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