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Proceedings Paper

Franz-Keldysh oscillations and Wannier-Stark localization in GaAs/AlAs superlattices
Author(s): Harald Schneider; A. Fischer; Klaus H. Ploog
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Paper Abstract

We have studied the electroabsorption properties of GaAs/AlAs superlattices with a 1 monolayer (ML) and 2 ML wide AlAs barriers. At large electric fields F parallel to the growth direction, Wannier-Stark localization of the carrier states is observed, even for the case of 1 ML AlAs barriers. In the low-field regime (up to 60 kV/cm), Franz-Keldysh oscillations are found. These oscillations are associated with the miniband dispersion of the superlattice. The oscillation period shows an F2/3 behavior, as theoretically expected. Numerical calculations on electroabsorption in strongly coupled superlattices are also presented.

Paper Details

Date Published: 3 September 1992
PDF: 10 pages
Proc. SPIE 1675, Quantum Well and Superlattice Physics IV, (3 September 1992); doi: 10.1117/12.137625
Show Author Affiliations
Harald Schneider, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
A. Fischer, Max-Planck-Institut fuer Festkoerperforschung (Germany)
Klaus H. Ploog, Max-Planck-Institut fuer Festkoerperforschung (Germany)

Published in SPIE Proceedings Vol. 1675:
Quantum Well and Superlattice Physics IV
Gottfried H. Doehler; Emil S. Koteles, Editor(s)

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