Title: Anharmonicity and localization of atomic vibrations in vitreous silica
Abstract:A numerical analysis has been made of anharmonicity effects for vibrational eigenmodes in a model of vitreous silica constructed by molecular dynamics. It is shown that in macroscopic systems all eige...A numerical analysis has been made of anharmonicity effects for vibrational eigenmodes in a model of vitreous silica constructed by molecular dynamics. It is shown that in macroscopic systems all eigenmodes are generally harmonic. Strong anharmonicity is found for the bare localized modes in the low-frequency region around the boson peak. This anharmonicity is related to the rotational motion of coupled ${\mathrm{SiO}}_{4}$ tetrahedra and differs in character from the anharmonicity of the high-frequency localized eigenmodes which are mainly related to symmetric and asymmetric stretching of ${\mathrm{SiO}}_{4}$ tetrahedra.Read More
Publication Year: 1999
Publication Date: 1999-04-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 124
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