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Article Dans Une Revue Nature Communications Année : 2015

Emergent vortices in populations of colloidal rollers

Jean-Baptiste Caussin
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Debasish Das
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Kyohei Shitara
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Fernando Peruani
David Saintillan

Résumé

Coherent vortical motion has been reported in a wide variety of populations including living organisms (bacteria, fishes, human crowds) and synthetic active matter (shaken grains, mixtures of biopolymers), yet a unified description of the formation and structure of this pattern remains lacking. Here we report the self-organization of motile colloids into a macroscopic steadily rotating vortex. Combining physical experiments and numerical simulations, we elucidate this collective behaviour. We demonstrate that the emergent-vortex structure lives on the verge of a phase separation, and single out the very constituents responsible for this state of polar active matter. Building on this observation, we establish a continuum theory and lay out a strong foundation for the description of vortical collective motion in a broad class of motile populations constrained by geometrical boundaries.

Dates et versions

hal-01292102 , version 1 (22-03-2016)

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Citer

Antoine Bricard, Jean-Baptiste Caussin, Debasish Das, Charles Savoie, Vijayakumar Chikkadi, et al.. Emergent vortices in populations of colloidal rollers. Nature Communications, 2015, 6, ⟨10.1038/ncomms8470⟩. ⟨hal-01292102⟩
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