@article {668,
	title = {Spontaneous rotation can stabilise ordered chiral active fluids},
	journal = {Nature Communications},
	volume = {10},
	year = {2019},
	month = {Feb-22-2019},
	pages = { Article Number: 920 },
	abstract = {<p>Active hydrodynamic theories are a powerful tool to study the emergent ordered phases of internally driven particles such as bird flocks, bacterial suspension and their artificial analogues. While theories of orientationally ordered phases are by now well established, the effect of chirality on these phases is much less studied. In this paper, we present a complete dynamical theory of orientationally ordered chiral particles in two-dimensional incompressible systems. We show that phase-coherent states of rotating chiral particles are remarkably stable in both momentum-conserved and non-conserved systems in contrast to their non-rotating counterparts. Furthermore, defect separation-which drives chaotic flows in non-rotating active fluids-is suppressed by intrinsic rotation of chiral active particles. We thus establish chirality as a source of dramatic stabilisation in active systems, which could be key in interpreting the collective behaviors of some biological tissues, cytoskeletal systems and collections of bacteria.</p>
},
	doi = {10.1038/s41467-019-08914-7},
	url = {http://www.nature.com/articles/s41467-019-08914-7},
	author = {Maitra, Ananyo and Lenz, Martin}
}
@article {631,
	title = {A nonequilibrium force can stabilize 2D active nematics},
	journal = {Proceedings of the National Academy of Sciences},
	volume = {115},
	year = {2018},
	month = {Jul-03-2018},
	pages = {6934-6939},
	abstract = {<p>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.</p>
},
	issn = {0027-8424},
	doi = {10.1073/pnas.1720607115},
	url = {http://www.pnas.org/lookup/doi/10.1073/pnas.1720607115},
	author = {Maitra, Ananyo and Srivastava, Pragya and Marchetti, M. Cristina and Lintuvuori, Juho S. and Ramaswamy, Sriram and Lenz, Martin}
}
