TY - JOUR
T1 - A nonequilibrium force can stabilize 2D active nematics
AU - Maitra, Ananyo
AU - Srivastava, Pragya
AU - Cristina Marchetti, M.
AU - Lintuvuori, Juho S.
AU - Ramaswamy, Sriram
AU - Lenz, Martin
N1 - Funding Information:
We thank Oleg Lavrentovich for pointing out the similarity between the active force and flexoelectric polarization. S.R. and M.C.M. thank the Kavli Institute for Theoretical Physics (KITP) for hospitality during completion of some of this work. This work was supported by Marie Curie Integration Grant PCIG12-GA-2012-334053, “Investisse-ments d’Avenir” Laboratoire d’excellence Physique:Atomes Lumière Matière (LabEx PALM) (ANR-10-LABX-0039-PALM), Agence Nationale de la Recherche (ANR) Grant ANR-15-CE13-0004-03, and European Research Council Groupement de Recherche Starting Grant 677532 (to M.L.). M.L.’s group belongs to the CNRS consortium Physique de la cellule au tissu Initiative d’excellence. S.R. acknowledges support from a J. C. Bose National Fellowship of the Science and Engineering Research Board, India and from the Tata Education and Development Trust. M.C.M. was supported by the US National Science Foundation Awards NSF-DMR-1609208 and NSF-DGE-1068780, by the Simons Foundation Targeted Grant 342354, and by the Syracuse Soft Matter and Living Matter Program. A.M., P.S., S.R., and M.C.M. also acknowledge the support of the Kavli Institute for Theoretical Physics under Grant NSF PHY11-25915. S.R. and M.C.M. also thank the KITP for support under Grant PHY-1748958. J.L was supported by the Initiative d’Excellence Bordeaux Junior Chair.
Funding Information:
ACKNOWLEDGMENTS. We thank Oleg Lavrentovich for pointing out the similarity between the active force and flexoelectric polarization. S.R. and M.C.M. thank the Kavli Institute for Theoretical Physics (KITP) for hospitality during completion of some of this work. This work was supported by Marie Curie Integration Grant PCIG12-GA-2012-334053, “Investisse-ments d’Avenir” Laboratoire d’excellence Physique:Atomes Lumière Matière (LabEx PALM) (ANR-10-LABX-0039-PALM), Agence Nationale de la Recherche (ANR) Grant ANR-15-CE13-0004-03, and European Research Council Groupement de Recherche Starting Grant 677532 (to M.L.). M.L.’s group belongs to the CNRS consortium Physique de la cellule au tissu Initiative d’excellence. S.R. acknowledges support from a J. C. Bose National Fellowship of the Science and Engineering Research Board, India and from the Tata Education and Development Trust. M.C.M. was supported by the US National Science Foundation Awards NSF-DMR-1609208 and NSF-DGE-1068780, by the Simons Foundation Targeted Grant 342354, and by the Syracuse Soft Matter and Living Matter Program. A.M., P.S., S.R., and M.C.M. also acknowledge the support of the Kavli Institute for Theoretical Physics under Grant NSF PHY11-25915. S.R. and M.C.M. also thank the KITP for support under Grant PHY-1748958. J.L was supported by the Initiative d’Excellence Bordeaux Junior Chair.
Publisher Copyright:
© 2018 National Academy of Sciences. All Rights Reserved.
PY - 2018/7/3
Y1 - 2018/7/3
N2 - 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.
AB - 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.
KW - Active matter
KW - Confined active nematics
KW - Living liquid crystals
UR - http://www.scopus.com/inward/record.url?scp=85049372275&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85049372275&partnerID=8YFLogxK
U2 - 10.1073/pnas.1720607115
DO - 10.1073/pnas.1720607115
M3 - Article
C2 - 29915056
AN - SCOPUS:85049372275
SN - 0027-8424
VL - 115
SP - 6934
EP - 6939
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 27
ER -