Low-energy excess of vibrational states in v-SiO2: the role of transverse dynamics

Details Low-energy excess of vibrational states in v-SiO2: the role of transverse dynamics Low-energy excess of vibrational states in v-SiO2: the role of transverse dynamics

2003-05-16

arxiv.org/abs/cond-mat/0305384v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

6 pages, 5 figures

Scientific paper

10.1088/0953-8984/16/47/006

The study of the effects of the density variations on the vibrational dynamics in vitreous silica is presented. A detailed analysis of the dynamical structure factor, as well as of the current spectra, allows the identification of a flattened transverse branch which is highly sensitive to the density variations. The experimental variations on the intensity and position of the Boson Peak (BP) in v-SiO2 as a function of density are reproduced and interpreted as being due to the shift and disappearance of the latter band. The BP itself is found to correspond to the lower energy tail of the excess states due to the piling up of vibrational modes at energies corresponding to the flattening of the transverse branch.

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