TY  - INPR
A1  - Machura, Lukasz
A1  - Kostur, Marcin
A1  - Talkner, Peter
A1  - Łuczka, Jerzy
A1  - Marchesoni, Fabio
A1  - Hänggi, Peter
T1  - Brownian motors: current fluctuations and rectification efficiency
N2  - 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.
KW  - Brownsche Bewegung
KW  - Thermisches Rauschen
KW  - Transportprozess
KW  - Fluktuation <Physik>
KW  - Brownian motion
KW  - current fluctuations
KW  - rectification
KW  - thermal noise
KW  - transport processes
KW  - electric motors
Y1  - 2006
UR  - https://opus.bibliothek.uni-augsburg.de/opus4/frontdoor/index/index/docId/349
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:384-opus4-2834
ER  -