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  4. Franz-Keldysh oscillations and Wannier-Stark localization in GaAs/AlAs superlattices with single-monolayer AlAs barriers
 
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1992
Journal Article
Title

Franz-Keldysh oscillations and Wannier-Stark localization in GaAs/AlAs superlattices with single-monolayer AlAs barriers

Other Title
Franz-Keldysh Oszillationen und Wannier-Stark Lokalisierung in GaAs/AlAs Übergittern mit Einzel-Monolayern AlAs Barrieren
Abstract
Using photocurrent spectroscopy, we have studied the absorption properties of GaAs/AlAs superlattices with only I-monolayer (ML) and 2-ML-wide AlAs barriers in an electric field F parallel to the growth direction. Wannier-Stark localization of the carrier states takes place at large electric fields, even for the case of I-ML AlAs barriers. In the low- field regime, Franz-Keldysh oscillations are observed at fields up to 60 kV/cm. The oscillation period shows an Fhigh2/3 behavior, as theoretically predicted, and is larger than expected from a one- electron model.
Author(s)
Fischer, A.
Ploog, K.
Schneider, H.
Journal
Physical Review. B  
DOI
10.1103/PhysRevB.45.6329
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Keyword(s)
  • Franz-Keldysh-oscillation

  • superlattice

  • Übergitter

  • Wannier-Stark localization

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