Dynamical Collective Memory in Fluidized Granular Materials

Physical Review Letters
A PlatiA Puglisi

Abstract

Recent experiments with rotational diffusion of a probe in a vibrated granular media revealed a rich scenario, ranging from a dilute gas to a dense liquid with cage effects and an unexpected superdiffusive behavior at large times. Here we set up a simulation that reproduces quantitatively the experimental observations and allows us to investigate the properties of the host granular medium, a task not feasible in the experiment. We discover a persistent collective rotational mode which emerges at a high density and a low granular temperature: a macroscopic fraction of the medium slowly rotates, randomly switching direction after very long times. Such a rotational mode of the host medium is the origin of the probe's superdiffusion. Collective motion is accompanied by a kind of dynamical heterogeneity at intermediate times (in the cage stage) followed by a strong reduction of fluctuations at late times, when superdiffusion sets in.

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Citations

Aug 17, 2020·Physical Review. E·Andrea Plati, Andrea Puglisi
Jul 10, 2021·The Journal of Chemical Physics·Lorenzo CapriniUmberto Marini Bettolo Marconi
Jul 18, 2021·Physical Review. E·Zackery A BensonWolfgang Losert
Jul 11, 2021·Scientific Reports·Andrea Plati, Andrea Puglisi

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