Dynamical Collective Memory in Fluidized Granular Materials

A. Plati, A. Baldassarri, A. Gnoli, G. Gradenigo, and A. Puglisi
Phys. Rev. Lett. 123, 038002 – Published 17 July 2019
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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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  • Received 21 January 2019
  • Revised 30 April 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.038002

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft MatterStatistical Physics & Thermodynamics

Authors & Affiliations

A. Plati1, A. Baldassarri2, A. Gnoli2, G. Gradenigo3, and A. Puglisi2

  • 1Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 2, 00185, Rome, Italy
  • 2Istituto dei Sistemi Complessi—CNR and Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 2, 00185, Rome, Italy
  • 3NANOTEC—CNR and Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 2, 00185, Rome, Italy

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Issue

Vol. 123, Iss. 3 — 19 July 2019

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