Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2011-06-16
J. Non-Cryst. Solids 357 (2011) 552-558, in Special Issue 6th International Discussion Meeting on Relaxation in Complex System
Physics
Condensed Matter
Disordered Systems and Neural Networks
9 pages, 12 figures
Scientific paper
10.1016/j.jnoncrysol.2010.06.064
We present in this paper a numerical study of the vibrational eigenvectors of a two-dimensional amorphous material, previously deeply studied from the point of view of mechanical properties and vibrational eigen-frequencies [7-10]. Attention is paid here to the connection between the mechanical properties of this material in term of elastic heterogeneities (EH), and how these inherent heterogeneous structures affect the vibrational eigenvectors and their plane waves decomposition. The systems are analysed for different hydrostatic pressures, and using results from previous studies, a deeper understanding of the boson peak scenario is obtained. The vibrational spectrum of a continuously densified silica glass is also studied, from which it appears that the pulsation associated with the boson peak follows the same pressure dependence trend than that of transverse waves with pulsation associated with the EH characteristic size.
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