Large-scale chaos and fluctuations in active nematics

Sandrine Ngo*, Anton Peshkov, Igor S. Aranson, Eric Bertin, Francesco Ginelli, Hugues Chate

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

We show that "dry" active nematics, e.g. collections of shaken elongated granular particles, exhibit large-scale spatiotemporal chaos made of interacting dense, ordered, band-like structures in a parameter region including the linear onset of nematic order. These results are obtained from the study of the relatively simple and well-known (deterministic) hydrodynamic equations describing these systems in a dilute limit, and of a self-propelled particle Vicsek-like model for this class of active matter. In this last case, revisiting the status of the strong fluctuations and long-range correlations now considered as landmarks of orientationally-ordered active phases, we show that the giant number fluctuations observed in the chaotic phase are a trivial consequence of density segregation. However anomalous density fluctuations are present in the homogeneous quasi-ordered nematic phase and characterized by a non-trivial scaling exponent.
Original languageEnglish
Article number038302
Number of pages6
JournalPhysical Review Letters
Volume113
Issue number3
DOIs
Publication statusPublished - 18 Jul 2014

Keywords

  • giant number fluctuations
  • matter
  • microtubules
  • systems
  • fluids

Cite this

Ngo, S., Peshkov, A., Aranson, I. S., Bertin, E., Ginelli, F., & Chate, H. (2014). Large-scale chaos and fluctuations in active nematics. Physical Review Letters, 113(3), [038302]. https://doi.org/10.1103/PhysRevLett.113.038302

Large-scale chaos and fluctuations in active nematics. / Ngo, Sandrine; Peshkov, Anton; Aranson, Igor S.; Bertin, Eric; Ginelli, Francesco; Chate, Hugues.

In: Physical Review Letters, Vol. 113, No. 3, 038302, 18.07.2014.

Research output: Contribution to journalArticle

Ngo, S, Peshkov, A, Aranson, IS, Bertin, E, Ginelli, F & Chate, H 2014, 'Large-scale chaos and fluctuations in active nematics', Physical Review Letters, vol. 113, no. 3, 038302. https://doi.org/10.1103/PhysRevLett.113.038302
Ngo S, Peshkov A, Aranson IS, Bertin E, Ginelli F, Chate H. Large-scale chaos and fluctuations in active nematics. Physical Review Letters. 2014 Jul 18;113(3). 038302. https://doi.org/10.1103/PhysRevLett.113.038302
Ngo, Sandrine ; Peshkov, Anton ; Aranson, Igor S. ; Bertin, Eric ; Ginelli, Francesco ; Chate, Hugues. / Large-scale chaos and fluctuations in active nematics. In: Physical Review Letters. 2014 ; Vol. 113, No. 3.
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N1 - We thank the Max Planck Institute for the Physics of Complex Systems, Dresden, for providing the framework of the Advanced Study Group “Statistical Physics of Collective Motion” within which much of this work was conducted. F. G. and S. N. acknowledge support from the EPSRC First Grant No. EP/K018450/1. The work of I. S. A. was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering, under Contract No. DEAC02-06CH11357.

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