Maitra, A and Srivastava, P and Marchetti, MC and Ramaswamy, S and Lenz, M (2020) Swimmer Suspensions on Substrates: Anomalous Stability and Long-Range Order. In: Physical Review Letters, 124 (2).
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Abstract
We present a comprehensive theory of the dynamics and fluctuations of a two-dimensional suspension of polar active particles in an incompressible fluid confined to a substrate. We show that, depending on the sign of a single parameter, a state with polar orientational order is anomalously stable (or anomalously unstable), with a nonzero relaxation (or growth) rate for angular fluctuations, not parallel to the ordering direction, at zero wave number. This screening of the broken-symmetry mode in the stable state does lead to conventional rather than giant number fluctuations as argued by Bricard et al., Nature 503, 95 (2013), but their bend instability in a splay-stable flock does not exist and the polar phase has long-range order in two dimensions. Our theory also describes confined three-dimensional thin-film suspensions of active polar particles as well as dense compressible active polar rods, and predicts a flocking transition without a banding instability. © 2020 American Physical Society.
| Item Type: | Journal Article |
|---|---|
| Publication: | Physical Review Letters |
| Publisher: | American Physical Society |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Incompressible flow; Substrates; Suspensions (fluids), Active particles; Broken symmetry; Incompressible fluid; Long range orders; Number fluctuations; Orientational orderings; Single parameter; Two-dimension, Suspensions (components) |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 04 Jan 2023 11:47 |
| Last Modified: | 04 Jan 2023 11:47 |
| URI: | https://eprints.iisc.ac.in/id/eprint/79468 |
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