Geometric origin of excess low-frequency vibrational modes in amorphous solids
arXiv:cond-mat/0409687 · doi:10.1209/epl/i2005-10245-5
Abstract
Glasses have a large excess of low-frequency vibrational modes in comparison with crystalline solids. We show that such a feature is a necessary consequence of the geometry generic to weakly connected solids. In particular, we analyze the density of states of a recently simulated system, comprised of weakly compressed spheres at zero temperature. We account for the observed a) constancy of the density of modes with frequency, b) appearance of a low-frequency cutoff, and c) power-law increase of this cutoff with compression. We predict a length scale below which vibrations are very different from those of a continuous elastic body.
4 pages, 2 figures. Argument rewritten, identical results
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