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• W2003237131 abstract "By means of Raman scattering, photoluminescence, and x-ray diffraction experiments, we have studied a series of ultrathin $mathrm{In}mathrm{As}∕mathrm{In}mathrm{P}$ single quantum wells grown with nominal well thickness varying between one and four monolayers. The observed Raman peaks are attributed to the first InAs-confined longitudinal optical phonon. When the quantum well is thinner than three monolayers, the measured frequencies of the confined modes depart from the predictions of the standard confined-phonon model but are in good agreement with the results of ab initio calculations based on density-functional theory. This indicates that there is a significant penetration of the InAs layer vibrations in the InP barriers and that thickness fluctuations occur at a scale short enough to further shift the phonon frequencies. When the wells contain more than three monolayers, a doublet Raman structure is observed which parallels the evolution of the photoluminescence spectra from single- to multiple-peak emission. We associate this simultaneous change in Raman and photoluminescence spectra with the two- to three-dimensional growth-mode transition." @default.
• W2003237131 created "2016-06-24" @default.
• W2003237131 creator A5009673562 @default.
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• W2003237131 date "2005-08-19" @default.
• W2003237131 modified "2023-10-17" @default.
• W2003237131 title "Raman study of optical phonons in ultrathin<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>In</mml:mi><mml:mi mathvariant=normal>As</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant=normal>In</mml:mi><mml:mi mathvariant=normal>P</mml:mi></mml:mrow></mml:math>single strained quantum wells" @default.
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• W2003237131 doi "https://doi.org/10.1103/physrevb.72.075349" @default.
• W2003237131 hasPublicationYear "2005" @default.
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