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Franz-Keldysh oscillations and Wannier-Stark localization in GaAs/AlAs superlattices.

Franz-Keldysh Oszillationen und Wannier-Stark Lokalisierung in GaAs/AlAs Übergittern
: Schneider, H.; Fischer, A.; Ploog, K.

Döhler, G.H. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Quantum-well and superlattice physics IV : 23-24 March 1992, Somerset, NJ
Bellingham, Wash.: SPIE, 1992 (SPIE Proceedings Series 1675)
ISBN: 0-8194-0836-0
Conference "Quantum-Well and Superlattice Physics" <4, 1992, Somerset/NJ>
Fraunhofer IAF ()
Franz-Keldysh-oscillation; superlattice; Übergitter; Wannier-Stark-localization; Wannier-Stark-Lokalisierung

We have studied the electroabsorption properties of GaAs/AlAs superlattices with 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 Fhigh2/3 behavior, as theoretically expected. Numerical calculations on electroabsorption in strongly coupled superlattices are also presented.