TitleExtreme active matter at high densities.
Publication TypeJournal Article
Year of Publication2020
AuthorsMandal R, Bhuyan PJyoti, Chaudhuri P, Dasgupta C, Rao M
JournalNat Commun
Date Published2020 May 22

We study the remarkable behaviour of dense active matter comprising self-propelled particles at large Péclet numbers, over a range of persistence times, from τ → 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 τ → ∞, when as f reduces, the fluid jams at a critical point, with stresses along force-chains. For intermediate τ, 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.

Alternate JournalNat Commun
PubMed ID32444608
PubMed Central IDPMC7244575
Grant ListIUSSTF-JC-026-2016 / / Indo-US Science and Technology Forum (IUSSTF) /