Relaxation processes in harmonic glasses?
Disordered Systems and Neural Networks
2009-10-31 v1
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0001030,
title = {Relaxation processes in harmonic glasses?},
author = {G. Ruocco and F. Sette and R. Di Leonardo and G. Monaco and M. Sampoli and T. Scopigno and G. Viliani},
journal= {arXiv preprint arXiv:cond-mat/0001030},
year = {2009}
}
Comments
11 pages, 3 figures