A sharp photoluminescence spectral feature has been observed in Alₓ{Ga}_{1{{-}}x}$As-GaAs multiple-quantum-well structures under high-intensity, resonant excitation at the ground-state exciton energy. This feature, which appears below the exciton ground state, emerges from a cold dense system of excitons, but prior to the breakup of excitons into an electron-hole plasma. A collective excitonic state is speculated.
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Le et al. (1985) studied this question.
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