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Title: Large-Scale Chaos and Fluctuations in Active Nematics

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, bandlike structures in a parameter region including the linear onset of nematic order. These results are obtained from the study of both the well-known (deterministic) hydrodynamic equations describing these systems and of the self-propelled particle model they were derived from. We prove, in particular, that the chaos stems from the generic instability of the band solution of the hydrodynamic equations. Revisiting the status of the strong fluctuations and long-range correlations in the particle model, we show that the giant number fluctuations observed in the chaotic phase are a trivial consequence of density segregation. However anomalous, curvature-driven number fluctuations are present in the homogeneous quasiordered nematic phase and characterized by a nontrivial scaling exponent.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1395042
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 3; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Ngo, Sandrine, Peshkov, Anton, Aranson, Igor S., Bertin, Eric, Ginelli, Francesco, and Chaté, Hugues. Large-Scale Chaos and Fluctuations in Active Nematics. United States: N. p., 2014. Web. doi:10.1103/PhysRevLett.113.038302.
Ngo, Sandrine, Peshkov, Anton, Aranson, Igor S., Bertin, Eric, Ginelli, Francesco, & Chaté, Hugues. Large-Scale Chaos and Fluctuations in Active Nematics. United States. doi:10.1103/PhysRevLett.113.038302.
Ngo, Sandrine, Peshkov, Anton, Aranson, Igor S., Bertin, Eric, Ginelli, Francesco, and Chaté, Hugues. Tue . "Large-Scale Chaos and Fluctuations in Active Nematics". United States. doi:10.1103/PhysRevLett.113.038302.
@article{osti_1395042,
title = {Large-Scale Chaos and Fluctuations in Active Nematics},
author = {Ngo, Sandrine and Peshkov, Anton and Aranson, Igor S. and Bertin, Eric and Ginelli, Francesco and Chaté, Hugues},
abstractNote = {We show that dry active nematics, e.g., collections of shaken elongated granular particles, exhibit large-scale spatiotemporal chaos made of interacting dense, ordered, bandlike structures in a parameter region including the linear onset of nematic order. These results are obtained from the study of both the well-known (deterministic) hydrodynamic equations describing these systems and of the self-propelled particle model they were derived from. We prove, in particular, that the chaos stems from the generic instability of the band solution of the hydrodynamic equations. Revisiting the status of the strong fluctuations and long-range correlations in the particle model, we show that the giant number fluctuations observed in the chaotic phase are a trivial consequence of density segregation. However anomalous, curvature-driven number fluctuations are present in the homogeneous quasiordered nematic phase and characterized by a nontrivial scaling exponent.},
doi = {10.1103/PhysRevLett.113.038302},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 3,
volume = 113,
place = {United States},
year = {2014},
month = {7}
}

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