Energy transport in jammed sphere packings
Soft Condensed Matter
2009-02-16 v2
Abstract
We calculate the normal modes of vibration in jammed sphere packings to obtain the energy diffusivity, a spectral measure of transport. At the boson peak frequency, we find an Ioffe-Regel crossover from a diffusivity that drops rapidly with frequency to one that is nearly frequency-independent. This crossover frequency shifts to zero as the system is decompressed towards the jamming transition, providing unambiguous evidence of a regime in frequency of nearly constant diffusivity. Such a regime, postulated to exist in glasses to explain the temperature dependence of the thermal conductivity, therefore appears to arise from properties of the jamming transition.
Cite
@article{arxiv.0806.3265,
title = {Energy transport in jammed sphere packings},
author = {Ning Xu and Vincenzo Vitelli and Matthieu Wyart and Andrea J. Liu and Sidney R. Nagel},
journal= {arXiv preprint arXiv:0806.3265},
year = {2009}
}
Comments
4 pages, 2 figures