Motile Topological Defects Hinder Dynamical Arrest in Dense Liquids of Active Ellipsoids

Arora, P and Sood, AK and Ganapathy, R (2022) Motile Topological Defects Hinder Dynamical Arrest in Dense Liquids of Active Ellipsoids. In: Physical Review Letters, 128 (17).

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Abstract

Recent numerical studies have identified the persistence time of active motion as a critical parameter governing glassy dynamics in dense active matter. Here we studied dynamics in liquids of granular active ellipsoids with tunable persistence and velocity. We show that increasing the persistence time at moderate supercooling is equivalent to increasing the strength of attraction in equilibrium liquids and results in reentrant dynamics not just in the translational degrees of freedom, as anticipated, but also in the orientational ones. However, at high densities, motile topological defects, unique to active liquids of elongated particles, hindered dynamical arrest. Most remarkably, for the highest activity, we observed intermittent dynamics due to the jamming-unjamming of these defects for the first time. © 2022 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review Letters
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to the American Physical Society.
Keywords:	Defects; Degrees of freedom (mechanics); Dynamics; Topology, Active motion; Dynamical arrests; Elongated particles; Glassy dynamics; High activity; Persistence time; Supercoolings; Topological defect; Translational degrees of freedoms; Tunables, Liquids, article; degree of freedom
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	27 May 2022 05:48
Last Modified:	27 May 2022 05:48
URI:	https://eprints.iisc.ac.in/id/eprint/72737

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