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  • Title: Brownian motors: current fluctuations and rectification efficiency.
    Author: Machura L, Kostur M, Talkner P, Łuczka J, Marchesoni F, Hänggi P.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2004 Dec; 70(6 Pt 1):061105. PubMed ID: 15697339.
    Abstract:
    With this work, we investigate an often neglected aspect of Brownian motor transport, namely, 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, unidirectional 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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