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Issue 13, 2014
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Freezing and phase separation of self-propelled disks

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We study numerically a model of soft polydisperse and non-aligning self-propelled particles interacting through elastic repulsion, which was recently shown to exhibit active phase separation in two dimensions in the absence of any attractive interaction or breaking of the orientational symmetry. We construct a phase diagram in terms of activity and packing fraction and identify three distinct regimes: a homogeneous liquid with anomalous cluster size distribution, a phase-separated state both at high and at low density, and a frozen phase. We provide a physical interpretation of the various regimes and develop scaling arguments for the boundaries separating them.

Graphical abstract: Freezing and phase separation of self-propelled disks

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Article information

20 Sep 2013
05 Dec 2013
First published
11 Dec 2013

Soft Matter, 2014,10, 2132-2140
Article type

Freezing and phase separation of self-propelled disks

Y. Fily, S. Henkes and M. C. Marchetti, Soft Matter, 2014, 10, 2132
DOI: 10.1039/C3SM52469H

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