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.
Author: | Lukasz MachuraORCiDGND, Marcin KosturGND, Peter TalknerGND, Jerzy Łuczka, Fabio MarchesoniORCiD, Peter HänggiORCiDGND |
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URN: | urn:nbn:de:bvb:384-opus4-2834 |
Frontdoor URL | https://opus.bibliothek.uni-augsburg.de/opus4/349 |
Type: | Preprint |
Language: | English |
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: http://link.aps.org/abstract/PRE/v70/e061105 |
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 |