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- W2418284280 abstract "We present a Raman-scattering study of [211]-oriented ${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{In}}_{mathit{x}}$As/GaAs multiple quantum wells grown by use of molecular-beam epitaxy. Off resonance, the Raman scattering satisfied bulk zinc-blende-structure selection rules. Near the (${mathit{E}}_{0}$+${mathrm{ensuremath{Delta}}}_{0}$) resonance, there is strong LO-phonon Raman scattering in the Z'(X',X')Zifmmodebarelsetextasciimacronfi{} ' configuration, where Z' refers to the growth axis and X' is in a (1ifmmodebarelsetextasciimacronfi{}11) direction. LO-phonon Raman scattering is forbidden in this configuration by bulk zinc-blende-structure selection rules and does not occur (or at least is much weaker) in [211]-oriented GaAs substrates near this resonance. This Raman process is due to Frohlich-interaction electron-phonon scattering activated by the strain-generated electric fields that occur in the multiple-quantum-well structure. We measure the resonance profile of this Raman process. The scattering efficiency is found to decrease with increasing laser intensity, because of a screening of the strain-generated fields by photoexcited free carriers. We present an electronic-structure calculation that accounts for the energy position of the resonance profile. Based on the electronic-structure results, we discuss simple models for the shape of the resonance profile. A free-carrier screening calculation accurately describes the observed laser-intensity dependence of the efficiency of this Raman process." @default.
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- W2418284280 title "Raman scattering near the (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=italic>E</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></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>Δ</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>) resonance from […" @default.
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- W2418284280 doi "https://doi.org/10.1103/physrevb.46.1480" @default.
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