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• W2316963399 abstract "In this paper we present an investigation of the optical transitions in strained ${mathrm{In}}_{mathit{x}}$${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$As-GaAs single and multiple quantum wells, for indium content xensuremath{simeq}10% and 20% and various well widths. The uniaxial stress dependence of reflectance and photoreflectance spectra permits unambiguous assignment of the experimental features to electron-heavy-hole and electron-light-hole excitonic transitions. Calculated transition energies are compared with the measured values. In these calculations, in the envelope-function formalism, the misfit-strain-induced coupling between the ${mathrm{ensuremath{Gamma}}}_{8}$ light-hole and the ${mathrm{ensuremath{Gamma}}}_{7}$ split-off valence bands is taken into account and the valence-band offset ratio is chosen as an adjustable parameter. By fitting all the experimental results to our calculations, the heavy-hole valence-band offset fraction ${mathit{Q}}_{mathit{v}mathit{h}}$ is determined to be about 0.34. This implies that these quantum wells are type I for the electron-heavy-hole system and type II for the electron-light-hole system, with the electrons and the heavy holes confined in the ${mathrm{In}}_{mathit{x}}$${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$As layers and the light holes in the GaAs barrier regions." @default.
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• W2316963399 date "1992-12-15" @default.
• W2316963399 modified "2023-10-16" @default.
• W2316963399 title "Photoreflectance and piezophotoreflectance studies of strained-layer<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>In</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=italic>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn…" @default.
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• W2316963399 doi "https://doi.org/10.1103/physrevb.46.15290" @default.
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