Electroreflectance studies of symmetrically coupled GaAs/AlGaAs double quantum wells

D. Y. Lin, Y. S. Huang, K. K. Tiong

Research output: Contribution to journalArticle

Abstract

Electroreflectance (ER) spectroscopy has been used to study two GaAs/AlGaAs symmetrically coupled double quantum wells (CDQWs) with different barrier widths as a function of various externally applied electric fields. The value of the internal field was directly evaluated from the Franz-Keldysh oscillations observed in the spectra of the AlGaAs barrier material. By comparing the ER spectra taken at the fundamental modulation frequency (If), second harmonic frequency and derivative of If spectrum, the features associated with red shift and blue shift were identified unambiguously. The shifts of the coupled quantum confined levels are in good agreement with a theoretical calculation based on solving the numerical solution of the effective-mass Schrödinger equation using the Runge-Kutta method.

Original languageEnglish
Pages (from-to)280-288
Number of pages9
JournalChinese Journal of Physics
Volume35
Issue number3
Publication statusPublished - 1997 Dec 1

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aluminum gallium arsenides
quantum wells
Runge-Kutta method
shift
blue shift
red shift
frequency modulation
harmonics
oscillations
electric fields
spectroscopy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Electroreflectance studies of symmetrically coupled GaAs/AlGaAs double quantum wells",
abstract = "Electroreflectance (ER) spectroscopy has been used to study two GaAs/AlGaAs symmetrically coupled double quantum wells (CDQWs) with different barrier widths as a function of various externally applied electric fields. The value of the internal field was directly evaluated from the Franz-Keldysh oscillations observed in the spectra of the AlGaAs barrier material. By comparing the ER spectra taken at the fundamental modulation frequency (If), second harmonic frequency and derivative of If spectrum, the features associated with red shift and blue shift were identified unambiguously. The shifts of the coupled quantum confined levels are in good agreement with a theoretical calculation based on solving the numerical solution of the effective-mass Schr{\"o}dinger equation using the Runge-Kutta method.",
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Electroreflectance studies of symmetrically coupled GaAs/AlGaAs double quantum wells. / Lin, D. Y.; Huang, Y. S.; Tiong, K. K.

In: Chinese Journal of Physics, Vol. 35, No. 3, 01.12.1997, p. 280-288.

Research output: Contribution to journalArticle

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