Vibrational spectrum of topologically disordered systems

Details Vibrational spectrum of topologically disordered systems Vibrational spectrum of topologically disordered systems

2001-02-13

arxiv.org/abs/cond-mat/0102230v2

Phys. Rev. Lett. 87, 085502 (2001)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Completely rewritten version, accepted in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.87.085502

The topological nature of the disorder of glasses and supercooled liquids strongly affects their high-frequency dynamics. In order to understand its main features, we analytically studied a simple topologically disordered model, where the particles oscillate around randomly distributed centers, interacting through a generic pair potential. We present results of a resummation of the perturbative expansion in the inverse particle density for the dynamic structure factor and density of states. This gives accurate results for the range of densities found in real systems.

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