Theory of unconfined excitons trapped by a quantum well

Guozhong Wen, Peiji Zhao, and Yia-chung Chang
Phys. Rev. B 54, 17779 – Published 15 December 1996
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Abstract

The energy levels and optical properties of unconfined excitons (excitons made of electron-hole pairs in the barrier material) interacting with a quantum well are studied via a variational method within the effective-mass approximation. The interplay of the relative motion and center-of-mass motion is examined carefully. The coupling of the unconfined excitons with the confined exciton via the emission of an acoustic phonon is examined. The effect of such coupling can produce much enhanced signals in the photoluminescence excitation (PLE) measurements. spectra. We perform simulation of the absorption and PLE spectra of an InxGa1xAs/GaAs quantum well based on this mechanism and compare our results with the experiment performed by Reynolds et al. [Phys. Rev. B 43, 1871 (1991)].

  • Received 19 July 1996

DOI:https://doi.org/10.1103/PhysRevB.54.17779

©1996 American Physical Society

Authors & Affiliations

Guozhong Wen*, Peiji Zhao, and Yia-chung Chang

  • Department of Physics and Material Research Laboratory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801

  • *Current address: Department of Physics, University of Houston, Houston, Texas.
  • Current address: Department of Physics, Stevens Institute of Technology, Hoboken, New Jersey.

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Issue

Vol. 54, Iss. 24 — 15 December 1996

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