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The effects of photoexcited free carriers on exciton dynamics in GaAs/AlGaAs quantum wells

✍ Scribed by B.M. Ashkinadze; E. Cohen; Arza Ron; E. Linder

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
140 KB
Volume
15
Category
Article
ISSN
0749-6036

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✦ Synopsis

We report on the effect of photogenerated free carriers on the spectral diffusion and on the LO-phonon Raman scattering of resonantly excited excitons. This is observed by an exciton population redistribution between localized states and by a decrease in the Raman scattering intensity under an extremely weak, additional, above bandgap excitation. We interpret these effects by a new channel for exciton transfer induced by free carrier -exciton scattering that adds up to the phonon assisted exciton tunneling between the states that arise from interface roughness.

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