TitleNonequilibrium phase transitions, fluctuations and correlations in an active contractile polar fluid.
Publication TypeJournal Article
Year of Publication2016
AuthorsGowrishankar K, Rao M
JournalSoft Matter
Volume12
Issue7
Pagination2040-6
Date Published2016 Feb 21
ISSN1744-6848
Abstract

We study the patterning, fluctuations and correlations of an active polar fluid consisting of contractile polar filaments on a two-dimensional substrate, using a hydrodynamic description. The steady states generically consist of arrays of inward pointing asters and show a continuous transition from a moving lamellar phase, a moving aster street, to a stationary aster lattice with no net polar order. We next study the effect of spatio-temporal athermal noise, parametrized by an active temperature TA, on the stability of the ordered phases. In contrast to its equilibrium counterpart, we find that the active crystal shows true long range order at low TA. On increasing TA, the asters dynamically remodel, concomitantly we find novel phase transitions characterized by bond-orientational and polar order upon "heating".

DOI10.1039/c5sm02527c
Alternate JournalSoft Matter
PubMed ID26742682