Extreme active matter at high densities

Mandal, R and Bhuyan, PJ and Chaudhuri, P and Dasgupta, C and Rao, M (2020) Extreme active matter at high densities. In: Nature Communications, 11 (1).

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Abstract

We study the remarkable behaviour of dense active matter comprising self-propelled particles at large Péclet numbers, over a range of persistence times, from τp → 0, when the active fluid undergoes a slowing down of density relaxations leading to a glass transition as the active propulsion force f reduces, to τp → ∞, when as f reduces, the fluid jams at a critical point, with stresses along force-chains. For intermediate τp, a decrease in f drives the fluid through an intermittent phase before dynamical arrest at low f. This intermittency is a consequence of periods of jamming followed by bursts of plastic yielding associated with Eshelby deformations. On the other hand, an increase in f leads to an increase in the burst frequency; the correlated plastic events result in large scale vorticity and turbulence. Dense extreme active matter brings together the physics of glass, jamming, plasticity and turbulence, in a new state of driven classical matter. © 2020, The Author(s).

Item Type:	Journal Article
Publication:	Nature Communications
Publisher:	Nature Research
Additional Information:	Copy right for this article belongs to Nature Research
Keywords:	deformation; glass; plastic; plasticity; turbulence; vorticity
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	25 Nov 2020 06:40
Last Modified:	25 Nov 2020 06:40
URI:	http://eprints.iisc.ac.in/id/eprint/65565

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