@article {Weber_nucleation,
	title = {Nucleation-induced transition to collective motion in active systems},
	journal = {Phys. Rev. E},
	volume = {86},
	year = {2012},
	month = {Sep},
	pages = {030901},
	publisher = {American Physical Society},
	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.},
	doi = {10.1103/PhysRevE.86.030901},
	url = {http://link.aps.org/doi/10.1103/PhysRevE.86.030901},
	author = {Weber, Christoph A. and Schaller, Volker and Bausch, Andreas R. and Frey, Erwin}
}
