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A nonequilibrium force can stabilize 2D active nematics

TitleA nonequilibrium force can stabilize 2D active nematics
Publication TypeJournal Article
Year of Publication2018
AuthorsMaitra A, Srivastava P, M. Marchetti C, Lintuvuori JS, Ramaswamy S, Lenz M
JournalProceedings of the National Academy of Sciences
Volume115
Issue27
Pagination6934-6939
Date PublishedJul-03-2018
ISSN0027-8424
Abstract

Suspensions of actively driven anisotropic objects exhibit distinctively nonequilibrium behaviors, and current theories predict that they are incapable of sustaining orientational order at high activity. By contrast, here we show that nematic suspensions on a substrate can display order at arbitrarily high activity due to a previously unreported, potentially stabilizing active force. This force moreover emerges inevitably in theories of active orientable fluids under geometric confinement. The resulting nonequilibrium ordered phase displays robust giant number fluctuations that cannot be suppressed even by an incompressible solvent. Our results apply to virtually all experimental assays used to investigate the active nematic ordering of self-propelled colloids, bacterial suspensions, and the cytoskeleton and have testable implications in interpreting their nonequilibrium behaviors.

URLhttp://www.pnas.org/lookup/doi/10.1073/pnas.1720607115
DOI10.1073/pnas.1720607115
Short TitleProc Natl Acad Sci USA
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