Excitable Patterns in Active Nematics
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CitationGiomi, Luca, Lakshminarayanan Mahadevan, Bulbul Chakraborty, and Michael F. Hagan. 2011. Excitable Patterns in Active Nematics. Physical Review Letters 106(21): 218101.
AbstractWe analyze a model of mutually propelled ﬁlaments suspended in a two-dimensional solvent. The system undergoes a mean-ﬁeld isotropic-nematic transition for large enough ﬁlament concentrations, and the nematic order parameter is allowed to vary in space and time. We show that the interplay between nonuniform nematic order, activity, and ﬂow results in spatially modulated relaxation oscillations, similar to those seen in excitable media. In this regime the dynamics consists of nearly stationary periods separated by ‘‘bursts’’ of activity in which the system is elastically distorted and solvent is pumped throughout. At even higher activity, the dynamics becomes chaotic.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:5128482
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