Energy transport in jammed sphere packings

Ning Xu, Vincenzo Vitelli, Matthieu Wyart, Andrea J. Liu, Sidney R. Nagel

    Research output: Contribution to journalArticlepeer-review


    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.

    Original languageEnglish (US)
    Article number038001
    JournalPhysical Review Letters
    Issue number3
    StatePublished - Jan 20 2009

    ASJC Scopus subject areas

    • General Physics and Astronomy


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