Department of Physics Papers

Document Type

Journal Article

Date of this Version

1-21-2009

Comments

Suggested Citation:
Xu, N., V. Vitelli, M. Wyart, A.J. Liu and S.R. Nagel. (2009). "Energy Transport in jammed Sphere Packings." Physical Review Letters. 102, 038001.

© The American Physical Society
http://dx.doi.org/10.1103/PhysRevLett.102.038001

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.

 

Date Posted: 06 January 2011

This document has been peer reviewed.