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  4. Time-resolved optical investigations of Bloch oscillations in semiconductor superlattices
 
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1996
Journal Article
Title

Time-resolved optical investigations of Bloch oscillations in semiconductor superlattices

Other Title
Zeitaufgelöste optische Unterschungen von Blochoszillationen in Halbleiter-Übergittern
Abstract
We present a complementary study of the interband and intraband dynamics of optically excited Bloch oscillations in GaAs/Al(ind x)Ga(ind 1-x)As superlattices. Distinct differences in the frequency and dephasing of the oscillations give evidence for Bloch oscillations performed by electrons in continuum states and by excitonic wavepackets. The dephasing time of the electronic continuum states is found to be exceptionally long as compared to the excitonic dephasing time under identical excitation conditions. These observations are confirmed by THz emission experiments, where Bloch oscillations are detected under optical excitation well above the fundamental band gap. The experimental observations suggest that the electronic coherence may be partially maintained during relaxation and momentum scattering processes.
Author(s)
Dekorsy, T.
Ott, R.
Leisching, P.
Bakker, H.J.
Waschke, C.
Roskos, H.G.
Kurz, H.
Köhler, Klaus  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Journal
Solid-State Electronics  
DOI
10.1016/0038-1101(95)00288-X
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Keyword(s)
  • III-V Halbleiter

  • III-V semiconductors

  • superlattice

  • time resolved optical spectroscopy

  • Übergitter

  • zeitaufgelöste optische Spektroskopie

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