By studying photoluminescence and photoluminescence excitation in coupled quantum wells, we investigate the influence of tunneling on the relaxation of photocreated carriers. The ability to vary the coupling strength between the wells by changing the tunnel-barrier thickness allowed us to study the influence of the carrier lifetime on excitation spectra. For sufficiently strong coupling, hot-exciton relaxation and resonant Raman scattering or ``hot'' luminescence, can be observed.
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Clérot et al. (1990) studied this question.
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