Relaxation processes in harmonic glasses?

Details Relaxation processes in harmonic glasses? Relaxation processes in harmonic glasses?

2000-01-04

arxiv.org/abs/cond-mat/0001030v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

11 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.84.5788

A relaxation process, with the associated phenomenology of sound attenuation and sound velocity dispersion, is found in a simulated harmonic Lennard-Jones glass. We propose to identify this process with the so called microscopic (or instantaneous) relaxation process observed in real glasses and supercooled liquids. A model based on the memory function approach accounts for the observation, and allows to relate to each others: 1) the characteristic time and strength of this process, 2) the low frequency limit of the dynamic structure factor of the glass, and 3) the high frequency sound attenuation coefficient, with its observed quadratic dependence on the momentum transfer.

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