Journal
EPL
Volume 103, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1209/0295-5075/103/30008
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Funding
- DFG [SFB TR6]
- ERC [267499]
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Motivated by recent experiments on colloidal suspensions, we study analytically and numerically a microscopic model for self-propelled particles lacking alignment interactions. In this model, even for purely repulsive interactions, a dynamical instability leading to phase separation has been reported. Starting from the many-body Smoluchowski equation, we develop a mean-field description based on a novel closure scheme and derive the effective hydrodynamic equations. We demonstrate that the microscopic origin of the instability is a force imbalance due to an anisotropic pair distribution leading to self-trapping. The phase diagram can be understood in terms of two quantities: a minimal drive and the force imbalance. At sufficiently high propulsion speeds there is a reentrance into the disordered fluid. Copyright (c) EPLA, 2013
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