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Proceedings Paper

Exciton modes in quantum barriers
Author(s): F. Martelli; Mario Capizzi; Andrea Frova; A. Polimeni; Francesca Sarto; M. R. Bruni; M. G. Simeone
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Paper Abstract

In this work, the experimental evidence of exciton confinement in the GaAs barriers of InGaAs/GaAs multiple-quantum-well structures is reported. This has been achieved by an ad hoc devised luminescence self-absorption spectroscopy method, as well as by standard photoluminescence, performed at different temperatures, which present a spectral feature at energies higher than those of bulk GaAs. The confinement energy and the linewidth depend on the barrier width, in agreement with a simple quantum mechanical model. Higher index states of the barrier exciton are also observed. The data underscore the critical importance of the choice of the sample-structure parameters for the confinement to be detectable.

Paper Details

Date Published: 19 November 1993
PDF: 7 pages
Proc. SPIE 1985, Physical Concepts and Materials for Novel Optoelectronic Device Applications II, (19 November 1993); doi: 10.1117/12.162798
Show Author Affiliations
F. Martelli, Fondazione Ugo Bordoni (Italy)
Mario Capizzi, Univ. di Roma 'La Sapienza' (Italy)
Andrea Frova, Univ. di Roma 'La Sapienza' (Italy)
A. Polimeni, Univ. di Roma 'La Sapienza' (Italy)
Francesca Sarto, Univ. di Roma 'La Sapienza' (Italy)
M. R. Bruni, ICMAT-CNR (Italy)
M. G. Simeone, ICMAT-CNR (Italy)

Published in SPIE Proceedings Vol. 1985:
Physical Concepts and Materials for Novel Optoelectronic Device Applications II
Fabio Beltram; Erich Gornik, Editor(s)

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