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Quantum beats of excitons in quantum wells

Quantenoszillationen von Exzitonen in Quantentrögen
: Schmitt-Rink, S.; Damen, T.; Göbel, E.O.; Köhler, K.; Leo, K.; Schäfer, W.; Shah, J.

Surface Science 267 (1992), pp.304-309 : Abb.,Lit.
ISSN: 0039-6028
Journal Article
Fraunhofer IAF ()
Quantentrog; quantum wells; time resolved photoluminescence; zeitaufgelöste Photolumineszenz

We review our observations of quantum beats of excitons in quantum wells arising from (i) heavy hole-light hole splitting, (ii) exciton splitting due to fluctuations in the well-width of quantum wells, and (iii) free and bound excitons, using the techniques of time resolved four-wave-mixing (FWM) and pump-and-probe (PP). We also discuss quantum beats in appropriately biased asymmetric double quantum wells, representing the first observation of coherent oscillations of an electronic wavepacket in a solid, and report on the observation of unusual polarization dependence in the FWM experiments.