Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
DY: Dynamik und Statistische Physik
DY 51: Einstein Symposium Brownian Motion, Diffusion and Beyond (SYBM) – Contributed Talks II
DY 51.9: Vortrag
Mittwoch, 9. März 2005, 12:15–12:30, TU H2032
Brownian motors: current fluctuations and rectification efficiency — •Lukasz Machura1,2, Marcin Kostur1, Peter Hänggi1, Peter Talkner1, and Jerzy Łuczka2 — 1Theoretical Physics I, Institute of Physics, Augsburg University — 2Department of Theoretical Physics, Institute of Physics, Silesian University, Poland
The quantity of foremost interest in the context of transport in Brownian motors is the mean velocity of the particle. Here, we address instead the fluctuations of the current, an often neglected aspect of the directed transport. These have a vital influence on the efficiency of rectifying noise [1]. 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. For tailored profiles of the ratchet potential, however, and appropriate drive parameters, we can identify a drastic enhancement of the rectification efficiency [1].
[1] L. Machura, M. Kostur, P. Talklner, J. Łuczka and P. Hänggi, Phys. Rev. E 70 xxxxxx (2004); preprint cond-mat/0409314