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 language | English |
|---|---|
| Pages (from-to) | 2729-2734 |
| Number of pages | 6 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 38 |
| Issue number | 5 A |
| Publication status | Published - 1999 Dec 1 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
- Physics and Astronomy(all)
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Second harmonic electroreflectance study of AlGaAs-GaAs asymmetric triangular and coupled double quantum wells. / Tiong, Kwong Kau; Lin, Der Yuh; Huang, Ying Sheng.
In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 38, No. 5 A, 01.12.1999, p. 2729-2734.Research output: Contribution to journal › Article
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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M3 - Article
AN - SCOPUS:0032625805
VL - 38
SP - 2729
EP - 2734
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 5 A
ER -