title: Critical asymmetry for giant diffusion of active Brownian particles.
abstract: We study the effect of an asymmetry on the transport properties of an active Brownian particle. We demonstrate the existence of a critical force or, more generally, of a critical asymmetry that separates parameter regimes of giant diffusion from those with reliable directed transport. We derive a condition for the critical asymmetry by means of an exact expression for the diffusion coefficient and by a simplified discrete picture. A critical asymmetry, as predicted by the simple model, is also found in a detailed model of coupled molecular motors displaying bidirectional motion.
authors.affiliation: Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38 01187 Dresden, Germany.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Lindner
authors.forename: Ernesto M
authors.initials: EM
authors.lastname: Nicola