Live Soap: Order, Fluctuations and Instabilities in Active Smectics

Details Live Soap: Order, Fluctuations and Instabilities in Active Smectics Live Soap: Order, Fluctuations and Instabilities in Active Smectics

2012-04-12

arxiv.org/abs/1204.2708v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 1 figure, submitted to Phys Rev Lett

Scientific paper

We construct a hydrodynamic theory of noisy, apolar active smectics, in bulk suspension or on a substrate. Our predictions include: quasi-long-ranged smectic order in dimension d = 2, and long- ranged in d = 3, extending previously published results to all dynamical regimes; Kosterlitz-Thouless melting to an active nematic at high and low concentrations in d = 2; nonzero second-sound speed parallel to the layers; the suppression of giant number fluctuations by smectic elasticity; instability to spontaneous undulation and flow in bulk contractile smectics; a layer spacing instability, possibly oscillatory, for large enough extensile active stresses.

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