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Proceedings Paper

Determination of the electric field in the Ga1-xAlxAs/GaAs heterojunctions from the Franz-Keldysh oscillations by photoreflectance spectroscopy
Author(s): Cesar A.C. Mendonca; L. M. R. Scolfaro; Elio Meneses; J. M. V. Martins; J. Roberto Leite
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Paper Abstract

The technique of photoreflectance (PR) spectroscopy has been applied to study the two-dimensional electron gas (2DEG) in a modulation-doped GaAlAs/GaAs heterojunction. We investigate the dependence on temperature of the PR results. At room temperature Franz-Keldysh oscillations-like features are observed. The energy spacing of this oscillations decreases with temperature. Theoretical self-consistent calculations have been carried out to determine the potential profile and sub-band energies in this system. The comparison of the values for the electric field estimated from the calculations and those extracted from the experiment suggests that the observed features are due to the electric field in the space charge region.

Paper Details

Date Published: 1 August 1990
PDF: 6 pages
Proc. SPIE 1286, Modulation Spectroscopy, (1 August 1990); doi: 10.1117/12.20866
Show Author Affiliations
Cesar A.C. Mendonca, Univ. Estadual de Campinas (Brazil)
L. M. R. Scolfaro, Univ. Estadual de Campinas (Brazil)
Elio Meneses, Univ. Estadual de Campinas (Brazil)
J. M. V. Martins, Univ. de Sao Paulo (Brazil)
J. Roberto Leite, Univ. de Sao Paulo (Brazil)

Published in SPIE Proceedings Vol. 1286:
Modulation Spectroscopy
Fred H. Pollak; Manuel Cardona; David E. Aspnes, Editor(s)

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