Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2005-05-10
J. Phys.: Condens. Matter 17 (2005) S3741-S3752; Erratum: J. Phys.: Condens. Matter 18 (2006) 1-2
Physics
Condensed Matter
Statistical Mechanics
Original paper: 14 pages, 7 figures, published in J. Phys.: Condens. Matter, as part of the special issue on Molecular Motors;
Scientific paper
10.1088/0953-8984/18/16/C01
In order to optimize the directed motion of an inertial Brownian motor, we identify the operating conditions that both maximize the motor current and minimize its dispersion. Extensive numerical simulation of an inertial rocked ratchet displays that two quantifiers, namely the energetic efficiency and the P\'eclet number (or equivalently the Fano factor), suffice to determine the regimes of optimal transport. The effective diffusion of this rocked inertial Brownian motor can be expressed as a generalized fluctuation theorem of the Green -- Kubo type. Addendum and Erratum The expression for the effective diffusion of an inertial, periodically driven Brownian particle in an asymmetric, periodic potential is compared with the step number diffusion which is extracted from the corresponding coarse grained hopping process specifying the number of covered spatial periods within each temporal period. The two expressions are typically different and involve the correlations between the number of hops.
Hänggi Peter
Kostur Marcin
Machura Lukasz
Marchesoni Fabio
Talkner Peter
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