Abstract
Layer width fluctuations in quantum wells and superlattices produce a random potential which has a pronounced effect on the dynamics of direct and indirect excitons. The potential fluctuations broaden the direct exciton line into a band in which excitons of sufficiently low energy are localized, being separated from the delocalized ones by an effective mobility edge. Four-wave mixing, resonant Rayleigh scattering, hole-burning and and photon echoes have been used to detect the localization of direct excitons in quantum wells. The mobility edge is found to be at the position predicted by classical percolation theory. In the case of indirect excitons, as in alloys, the most pronounced effect of the disorder is on the decay kinetics, which are strongly affected by localization.
Work done at Bell Communications Research, Red Bank NJ.and at Bell Labs, Murray Hill NJ, in collaboration with J.Hegarty, L.Schultheis, E-Pinkman, M.-H.Meynadier, L. Goldner, M.C.Tamargo, A.C.Gossard and W.Wiegmann.
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© 1988 Plenum Press, New York
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Sturge, M.D. (1988). Excitons in Quantum Wells and Short Period Superlattices. In: Birman, J.L., Cummins, H.Z., Kaplyanskii, A.A. (eds) Laser Optics of Condensed Matter. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7341-8_11
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DOI: https://doi.org/10.1007/978-1-4615-7341-8_11
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