Second harmonic electroreflectance study of AlGaAs-GaAs asymmetric triangular and coupled double quantum wells

Kwong Kau Tiong, Der Yuh Lin, Ying Sheng Huang

Research output: Contribution to journalArticle

Abstract

Electroreflectance (ER) spectroscopy is used to study AlGaAs-GaAs asymmetric triangular and coupled double quantum wells. The ER spectra are taken at both the fundamental (1f) and second harmonic (2f) modulation frequencies. A detailed ER lineshape analysis appropriate for a Lorentzian dielectric function is presented. The experimental 1f and 2f spectra arc, respectively, shown to be related to the first and second order field induced changes in the dielectric function. A detail comparison of the line shapes of the 1f, 2f and energy derivative of the 1f spectra and their respective spectral forms enable a qualitative deduction of the dominant mechanism of the experimental ER spectra. In particular, for the asymmetric triangular well structure, the dominance of excitonic modulation mechanism can be inferred. Useful additional information on the sample signature such as the features associated with the red and blue shifts are obtained through such a comparative study. In addition, several weak features are observed to be significantly enhanced in the 2f spectra and the characteristics of these features are deduced.

Original languageEnglish
Pages (from-to)2729-2734
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume38
Issue number5 A
Publication statusPublished - 1999 Dec 1

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Semiconductor quantum wells
aluminum gallium arsenides
quantum wells
harmonics
Frequency modulation
Modulation
Spectroscopy
Derivatives
deduction
blue shift
red shift
frequency modulation
line shape
arcs
signatures
modulation
spectroscopy
energy

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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title = "Second harmonic electroreflectance study of AlGaAs-GaAs asymmetric triangular and coupled double quantum wells",
abstract = "Electroreflectance (ER) spectroscopy is used to study AlGaAs-GaAs asymmetric triangular and coupled double quantum wells. The ER spectra are taken at both the fundamental (1f) and second harmonic (2f) modulation frequencies. A detailed ER lineshape analysis appropriate for a Lorentzian dielectric function is presented. The experimental 1f and 2f spectra arc, respectively, shown to be related to the first and second order field induced changes in the dielectric function. A detail comparison of the line shapes of the 1f, 2f and energy derivative of the 1f spectra and their respective spectral forms enable a qualitative deduction of the dominant mechanism of the experimental ER spectra. In particular, for the asymmetric triangular well structure, the dominance of excitonic modulation mechanism can be inferred. Useful additional information on the sample signature such as the features associated with the red and blue shifts are obtained through such a comparative study. In addition, several weak features are observed to be significantly enhanced in the 2f spectra and the characteristics of these features are deduced.",
author = "Tiong, {Kwong Kau} and Lin, {Der Yuh} and Huang, {Ying Sheng}",
year = "1999",
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TY - JOUR

T1 - Second harmonic electroreflectance study of AlGaAs-GaAs asymmetric triangular and coupled double quantum wells

AU - Tiong, Kwong Kau

AU - Lin, Der Yuh

AU - Huang, Ying Sheng

PY - 1999/12/1

Y1 - 1999/12/1

N2 - Electroreflectance (ER) spectroscopy is used to study AlGaAs-GaAs asymmetric triangular and coupled double quantum wells. The ER spectra are taken at both the fundamental (1f) and second harmonic (2f) modulation frequencies. A detailed ER lineshape analysis appropriate for a Lorentzian dielectric function is presented. The experimental 1f and 2f spectra arc, respectively, shown to be related to the first and second order field induced changes in the dielectric function. A detail comparison of the line shapes of the 1f, 2f and energy derivative of the 1f spectra and their respective spectral forms enable a qualitative deduction of the dominant mechanism of the experimental ER spectra. In particular, for the asymmetric triangular well structure, the dominance of excitonic modulation mechanism can be inferred. Useful additional information on the sample signature such as the features associated with the red and blue shifts are obtained through such a comparative study. In addition, several weak features are observed to be significantly enhanced in the 2f spectra and the characteristics of these features are deduced.

AB - Electroreflectance (ER) spectroscopy is used to study AlGaAs-GaAs asymmetric triangular and coupled double quantum wells. The ER spectra are taken at both the fundamental (1f) and second harmonic (2f) modulation frequencies. A detailed ER lineshape analysis appropriate for a Lorentzian dielectric function is presented. The experimental 1f and 2f spectra arc, respectively, shown to be related to the first and second order field induced changes in the dielectric function. A detail comparison of the line shapes of the 1f, 2f and energy derivative of the 1f spectra and their respective spectral forms enable a qualitative deduction of the dominant mechanism of the experimental ER spectra. In particular, for the asymmetric triangular well structure, the dominance of excitonic modulation mechanism can be inferred. Useful additional information on the sample signature such as the features associated with the red and blue shifts are obtained through such a comparative study. In addition, several weak features are observed to be significantly enhanced in the 2f spectra and the characteristics of these features are deduced.

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