Time-resolved study of dephasing mechanisms of excitons in GaAs/AlxGa1xAs quantum-well structures

Huib J. Bakker, Karl Leo, Jagdeep Shah, and Klaus Köhler
Phys. Rev. B 49, 8249 – Published 15 March 1994
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Abstract

We present an experimental and theoretical study of the dephasing of heavy-hole excitons in a 70-Å GaAs/AlxGa1xAs multiple-quantum-well stucture. We measure the time-integrated three-pulse four-wave-mixing signal of heavy-hole excitons in the quantum-well sample. We model the third-order nonlinear optical response incorporating the effects of a stochastic modulation of the transition frequency. We find that the dephasing of the nonlinear polarization is mainly the result of a spectral-migration process of the excitons and, to a lesser extent, due to a homogeneous dephasing process. The time dependence of the four-wave-mixing signal is very well described by theory if the spectral-migration process is assumed to be energy dependent.

  • Received 21 October 1993

DOI:https://doi.org/10.1103/PhysRevB.49.8249

©1994 American Physical Society

Authors & Affiliations

Huib J. Bakker and Karl Leo

  • Institut für Halbleitertechnik II, Rheinisch-Westfälische Technische Hochschule Aachen, D-52056 Aachen, Germany

Jagdeep Shah

  • AT&T Bell Laboratories, Holmdel, New Jersey 07733

Klaus Köhler

  • Fraunhofer-Institut für Angewandte Festkörperphysik, D-79108 Freiburg, Germany

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Vol. 49, Iss. 12 — 15 March 1994

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