2001/10/07 by Tomás S. Grigera, T. S. Grigera, Grigera, T. S. +7
Engineering · Materials Science · Physics and Astronomy · #Advanced Fiber Optic Sensors #Condensed Matter (cond-mat) #FOS: Physical sciences #Glass properties and applications #Material Dynamics and Properties #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/0110129
4 pages, 3 postscript figures
arxiv created 2001/10/07 · openalex publication_date 2001/10/07 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study, analytically and numerically, an off-lattice model of scalar harmonic vibrations for structural glasses. The model has a Boson-Peak which we argue can be considered as a prototype for materials with a Boson Peak frequency that decreases with lowering temperature. The density evolution of the Boson Peak in silica is qualitatively reproduced. The dispersion relation is linear at the Boson Peak frequency, in agreement with experiments. In our model the Boson Peak is a precursor of a nearby mechanical instability. The Boson Peak is built up by the hybridization of the sound waves with extended, but non propagating (in the sense of a flat dispersion relation), modes.