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Festkörperprobleme 31 pp 219–241Cite as

Picosecond time-resolved light scattering from coherent exciton states

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Part of the book series: Advances in Solid State Physics ((ASSP,volume 31))

Abstract

Optical excitation by ultrashort laser pulses allows to prepare excitons in coherent, i. e. quantum mechanically pure states. These states then will be destroyed by relaxation processes, giving rise to the homogeneous linewidth of the states. It is shown that from the time-resolved resonant light scattering spectrum the various inelastic (energy-relaxation) and elastic (phase-relaxation) relaxation processes for an exciton system interacting with a thermal bath can be deduced, taking properly the implications of the measurement process into account. It is demonstrated how the time dependence and polarization properties of the scattered light can be exploited to discriminate between scattering (Rayleight or Raman) processes, proceeding without loss of coherence, and hot luminescence, occurring after phase-relaxation. The coherent nature of the states can be directly observed by quantum beats in the time-dependent scattering spectrum if the resonant states are energetically split. The experimental results for free excitons in GaAs/AlGaAs quantum well structures and in AgBr as well as for bound excitons in CdS are found in good agreement with the theoretical expectations.

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Authors and Affiliations

  1. Fachbereich Physik, Universität-GH, Warburger Str. 100A, D-4790, Paderborn, Fed. Rep. Germany

    Heinrich Stolz

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  1. Heinrich Stolz
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Ulrich Rössler

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© 1991 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH

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Stolz, H. (1991). Picosecond time-resolved light scattering from coherent exciton states. In: Rössler, U. (eds) Festkörperprobleme 31. Advances in Solid State Physics, vol 31. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0107869

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  • DOI: https://doi.org/10.1007/BFb0107869

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-528-08039-6

  • Online ISBN: 978-3-540-75343-8

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