Kavli Affiliate: Mark J. Bowick
| First 5 Authors: Supavit Pokawanvit, Zhitao Chen, Zhihong You, Luiza Angheluta, M. Cristina Marchetti
| Summary:
We study two-dimensional active nematics on a substrate, comparing
compressible and incompressible flows. Through simulations and theoretical
analysis we show that arch patterns are stable in the compressible case but are
unstable in an incompressible system. For compressible flows at high activity,
stable arches organize in a smectic-like pattern, with associated global polar
order of $+1/2$ nematic defects. By contrast, incompressible flows give rise to
local nematic order of the $+1/2$ defects, consisting of anti-aligned pairs of
neighboring defects, as previously established.
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