Melting a granular glass by cooling

Abstract

Driven granular systems readily form glassy phases at high particle volume fractions and low driving amplitudes. We use computer simulations of a driven granular glass to evidence a re-entrance melting transition into a fluid state, which, contrary to intuition, occurs by \emph{reducing} the amplitude of the driving. This transition is accompanied by anomalous particle dynamics and super-diffusive behavior on intermediate time-scales. We highlight the special role played by frictional interactions, which help particles to escape their glassy cages. Such an effect is in striking contrast to what friction is expected to do: reduce particle mobility by making them stick.

References in corpus (5)

• Stationary state volume fluctuations in a granular medium
• Packing grains by thermally cycling
• Glass Transition for Driven Granular Fluids
• Stripe formation in differentially forced binary systems
• Lower bound on the four-point dynamical susceptibility: Direct experimental test on a granular packing