A nonequilibrium force can stabilize 2D active nematics

Ananyo Maitra, Pragya Srivastava, M. Cristina Marchetti, Juho S. Lintuvuori, Sriram Ramaswamy, Martin Lenz

Research output: Contribution to journalArticle

16 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)6934-6939
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume115
Issue number27
DOIs
StatePublished - Jul 3 2018

Keywords

  • Active matter
  • Confined active nematics
  • Living liquid crystals

ASJC Scopus subject areas

  • General

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    Maitra, A., Srivastava, P., Cristina Marchetti, M., Lintuvuori, J. S., Ramaswamy, S., & Lenz, M. (2018). A nonequilibrium force can stabilize 2D active nematics. Proceedings of the National Academy of Sciences of the United States of America, 115(27), 6934-6939. https://doi.org/10.1073/pnas.1720607115