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- W1987367690 abstract "We report high-resolution Raman measurements of the gap widths of folded longitudinal-acoustic phonons in Si/${mathrm{Si}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Ge}}_{mathit{x}}$ superlattices. The first four gap widths at the minizone boundary were studied systematically. It was found that to fit the measured gap widths by Rytov theory one has to use a reduced sound velocity and density from that of bulk Si for the Si layers and a higher sound velocity and density of the alloy layers than the value deduced by linear interpolation. In the high-resolution measurements fine structure of the phonon peaks was observed together with a linewidth narrowing when approaching the minizone boundary. The variation of the scattering intensities recorded at different wavelengths and for several orders of folding provides an opportunity for a precise test of light scattering theory near the minizone boundary." @default.
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- W1987367690 date "1992-10-15" @default.
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- W1987367690 title "Precise measurements of the gap energy of folded acoustic phonons in Si/<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Si</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant=normal>−</mml:mi><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 …" @default.
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- W1987367690 doi "https://doi.org/10.1103/physrevb.46.9881" @default.
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