Brownian motors: current fluctuations and rectification efficiency

  • With this work we investigate an often neglected aspect of Brownian motor transport: The role of fluctuations of the noise-induced current and its consequences for the efficiency of rectifying noise. In doing so, we consider a Brownian inertial motor that is driven by an unbiased monochromatic, time-periodic force and thermal noise. Typically, we find that the asymptotic, time- and noise-averaged transport velocities are small, possessing rather broad velocity fluctuations. This implies a corresponding poor performance for the rectification power. However, for tailored profiles of the ratchet potential and appropriate drive parameters, we can identify a drastic enhancement of the rectification efficiency. This regime is marked by persistent, uni-directional motion of the Brownian motor with few back-turns, only. The corresponding asymmetric velocity distribution is then rather narrow, with a support that predominantly favors only one sign for the velocity.

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Author:Lukasz MachuraORCiDGND, Marcin KosturGND, Peter TalknerGND, Jerzy Łuczka, Fabio MarchesoniORCiD, Peter HänggiGND
Frontdoor URL
Year of first Publication:2004
Publishing Institution:Universität Augsburg
Release Date:2006/09/05
Tag:Brownian motion; current fluctuations; rectification; thermal noise; transport processes; electric motors
GND-Keyword:Brownsche Bewegung; Thermisches Rauschen; Transportprozess; Fluktuation <Physik>
Source:erschienen in: Phys. Rev. E 70, 061105 (2004); DOI: 10.1103/PhysRevE.70.061105; URL:
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Theoretische Physik I
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik