Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 115, Issue 27, Pages 6934-6939Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1720607115
Keywords
active matter; living liquid crystals; confined active nematics
Categories
Funding
- Marie Curie Integration Grant [PCIG12-GA-2012-334053]
- Investissements d'Avenir Laboratoire d'excellence Physique: Atomes Lumiere Matiere (LabEx PALM) [ANR-10-LABX-0039-PALM]
- Agence Nationale de la Recherche (ANR) Grant [ANR-15-CE13-0004-03]
- European Research Council Groupement de Recherche Starting Grant [677532]
- J. C. Bose National Fellowship of the Science and Engineering Research Board, India
- Tata Education and Development Trust
- US National Science Foundation [NSF-DMR-1609208, NSF-DGE-1068780]
- Simons Foundation Targeted Grant [342354]
- Syracuse Soft Matter and Living Matter Program
- Kavli Institute for Theoretical Physics [NSF PHY11-25915]
- KITP [PHY-1748958]
- Initiative d'Excellence Bordeaux
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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.
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