Heat transfer in model amorphous solids

ORAL

Abstract

We investigate heat transfer in model amorphous solids obtained from jammed packings of soft spheres. At the boson peak frequency, we find a sharp crossover from a weak-scattering regime, in which the energy diffusivity drops rapidly with frequency, to a strong-scattering regime, in which the diffusivity is nearly frequency-independent. We present a scaling analysis of how the crossover frequency shifts to zero as the system is decompressed towards the jamming transition. We show that the regime of flat diffusivity, invoked to explain the temperature dependence of the thermal conductivity of glasses, can arise from properties of the jamming transition.

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Authors

  • Vincenzo Vitelli

    Department of Physics, University of Pennsylvania, University of Pennsylvania

  • Ning Xu

    Department of Physics, University of Pennsylvania, University of Pennsylvania and University of Chicago

  • Matthieu Wyart

    HSEAS, Harvard University

  • Andrea J. Liu

    Department of Physics, University of Pennsylvania, University of Pennsylvania, Department of Physics and Astronomy, University of Pennsylvania

  • Sidney Nagel

    James Frank Institute, University of Chicago, University of Chicago