| Issue |
Europhys. Lett.
Volume 39, Number 1, July I 1997
|
|
|---|---|---|
| Page(s) | 37 - 42 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00310-1 | |
| Published online | 01 September 2002 | |
Phonons in vitreous silica: Dispersion and localization
Department of Chemistry, University of Cambridge,
Lensfield Road, Cambridge CB2 1EW, UK
Received:
28
January
1997
Accepted:
29
May
1997
A numerical vibrational-mode analysis has been performed for structural
models of vitreous silica constructed using molecular dynamics.
Dispersion curves, associated with remnants of phonon-like behaviour,
exhibit pseudo-zone boundaries revealing evidence for two pseudo-periods
in the structure, the dominant one being equal to the height of 
tetrahedra, and the other to the corresponding height of 
tetrahedra.
A new model for the boson peak is proposed: the excess modes are the lowest
optic band states hybridized with acoustic states.
PACS: 61.43.Bn – Structural modeling: serial-addition models, computer simulation / 61.43.Fs – Glasses / 63.50.+x – Vibrational states in disordered systems
© EDP Sciences, 1997
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