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  4. Photogalvanic effect in asymmetric quantum wells and superlattices
 
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1998
Journal Article
Title

Photogalvanic effect in asymmetric quantum wells and superlattices

Other Title
Photogalvanischer Effect in asymmetrischen Quantenfilmen und Übergittern
Abstract
We have investigated the influence of the final states of bound-to-continuum transitions within the conduction band of asymmetric quantum well structures on the photocurrent. This influence manifests itself by an energy-dependent oscillation of the current direction. We observe pronounced oscillations at zero bias voltage in a double quantum well structure, induced by an asymmetric excitation into continuum states with positive and negative momentum, i.e. by a photogalvanic effect (PGE). If this effect is superimposed on an asymmetric backrelaxation, similar oscillations are observed in the spectrum when the latter asymmetry is compensated by an external electric field. Theoretically, we find a strong relation between the PGE and a quantum interference effect occurring in the a strong re continuum.
Author(s)
Schneider, H.
Ehret, S.
Schönbein, C.
Schwarz, Klaus  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Bihlmann, G.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Fleissner, J.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Tränkle, G.
Böhm, G.
Journal
Superlattices and Microstructures  
DOI
10.1006/spmi.1996.0225
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Keyword(s)
  • infrared detector

  • Infrarotdetektor

  • intersubband transition

  • Intersubband-Übergang

  • photogalvanic effect

  • photogalvanischer Effekt

  • quantum wells

  • superlattice

  • Übergitter

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