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Re-entrant phase separation in nematically aligning active polar particles


We present a numerical study of the phase behavior of repulsively interacting active polar particles that align their active velocities nematically. The amplitude of the active velocity, and the noise in its orientational alignment control the active nature of the system. At high values of orientational noise, the structural fluid undergoes a continuous nematic-isotropic transition in active orientation. This transition is well separated from an active phase separation, characterized by the formation of high density hexatic clusters, observed at lower noise strengths. With increasing activity, the system undergoes a re-entrant fluid- phase separation- fluid transition. The phase coexistence at low activity can be understood in terms of motility induced phase separation. In contrast, the re-melting of hexatic clusters, and the collective motion at low orientational noise are dominated by flocking behavior. At high activity, sliding and jamming of polar sub-clusters, formation of grain boundaries, lane formation, and subsequent fragmentation of the polar patches mediate remelting.

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Publication details

The article was received on 17 May 2019, accepted on 26 Sep 2019 and first published on 26 Sep 2019

Article type: Paper
DOI: 10.1039/C9SM00998A
Soft Matter, 2019, Accepted Manuscript

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    Re-entrant phase separation in nematically aligning active polar particles

    B. Bhattacherjee and D. Chaudhuri, Soft Matter, 2019, Accepted Manuscript , DOI: 10.1039/C9SM00998A

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