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Multiple Types of Aging in Active Glasses

Rituparno Mandal1,* and Peter Sollich1,2,†

  • 1Institute for Theoretical Physics, Georg-August-Universität Göttingen, 37077 Göttingen, Germany
  • 2Department of Mathematics, King’s College London, London WC2R 2LS, United Kingdom

  • *rituparno.mandal@uni-goettingen.de
  • †peter.sollich@uni-goettingen.de
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Phys. Rev. Lett. 125, 218001 – Published 16 November, 2020

DOI: https://doi.org/10.1103/PhysRevLett.125.218001

Abstract

Recent experiments and simulations have revealed glassy features in, e.g., cytoplasm, living tissues and dense assemblies of self-propelled colloids. This leads to a fundamental question: how do these nonequilibrium (active) amorphous materials differ from conventional passive glasses, created by lowering temperature or increasing density? To address this we investigate the aging after a quench to an almost arrested state of a model active glass former, a Kob-Andersen glass in two dimensions. Each constituent particle is driven by a constant propulsion force whose direction diffuses over time. Using extensive molecular dynamics simulations we reveal rich aging behavior of this dense active matter system: short persistence times of the active forcing give effective thermal aging; in the opposite limit we find a two-step aging process with active athermal aging at short times and activity-driven aging at late times. We develop a dedicated simulation method that gives access to this longtime scaling regime for highly persistent active forces.

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Phys. Rev. Lett. 125, 218001– Published 16 November, 2020
  • Received 7 February 2020
  • Accepted 20 October 2020
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