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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2004

Vibrations of free and embedded anisotropic elastic spheres:Application to low-frequency Raman scattering of silicon nanoparticles in silica

Résumé

Vibrational mode frequencies and damping arecalculated for an elastic sphere embedded in an infinite, homogeneous, isotropic elastic medium. Anisotropic elasticity of the sphere significantly shifts the frequencies in comparison to simplified calculations that assume isotropy. New low frequencyRaman light scattering data are presented forsilicon spheres grown in a SiO2 glass matrix. Principal features of the Raman spectrum are not correctly described by a simple model of the nanoparticle as a free, isotropic sphere, but require both matrix effects and the anisotropyof the silicon to be taken into account.Libration, not vibration, is the dominant mechanism.
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Dates et versions

hal-00000522 , version 1 (25-07-2003)

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Lucien Saviot, Maria del Carmen Marco de Lucas, Daniel B. Murray. Vibrations of free and embedded anisotropic elastic spheres:Application to low-frequency Raman scattering of silicon nanoparticles in silica. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2004, 69, pp.113402. ⟨10.1103/PhysRevB.69.113402⟩. ⟨hal-00000522⟩
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