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Nucleation-induced transition to collective motion in active systems

By Christoph. A. Weber, Volker Schaller, Andreas R. Bausch and Erwin Frey

Abstract

While the existence of polar ordered states in active systems is well established, the dynamics of the self-assembly processes are still elusive. We study a lattice gas model of self-propelled elongated particles interacting through excluded volume and alignment interactions, which shows a phase transition from an isotropic to a polar ordered state. By analyzing the ordering process we find that the transition is driven by the formation of a critical nucleation cluster and a subsequent coarsening process. Moreover, the time to establish a polar ordered state shows a power-law divergence

Topics: Condensed Matter - Soft Condensed Matter
Year: 2012
DOI identifier: 10.1103/PhysRevE.86.030901
OAI identifier: oai:arXiv.org:1208.5448

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