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Coherent exciton-photon dynamics in single, double, and quintuple quantum wells.

Kohärente Exziton-Photon Dynamik in Einfach-, Doppel und Fünffach Quantenfilmen


Il Nuovo Cimento della societa Italiana di Fisica. D, Condensed matter, atomic, molekular and chemical physics, fluids, plasmas, biophysics 17D (1995), Nr.11/12, S.1769-1774
ISSN: 0392-6737
Fraunhofer IAF ()
heterostructure; Heterostruktur; III-V Halbleiter; III-V semiconductors; quantum wells; time resolved electrical measurement; zeitaufgelöste Messung

We have studied experimentally the coherent exciton-photon dynamics in a single, a double, and a quintuple quantum well structure under resonant excitation. In pump and probe experiments we observe an initial fast decay of the exciton population. This initial decay depends on the number of quantum wells. The population decay is accompanied by a coherent light emission induced by the first-order polarization, the intensity of which increases quadratically with the quantum well number. Interference effects and electromagnetic coupling effects between polarizations located in distinct quantum wells probably play a crucial role in the superlinear coherent emission process.