Noise-induced transport with low randomness.
We study the transport of overdamped Brownian particles in periodic potentials subject to a spatially modulated Gaussian white noise. We derive an analytical expression for the diffusion coefficient of particles. By means of velocity, diffusion coefficient, and their ratio (Péclet number) we discuss (a) symmetric potential and modulation of noise intensity and (b) a ratchet profile with strong noise modulation. It is shown that state dependent fluctuations may not only induce directed transport, but also a pronounced coherence of transport if the potential exhibits a strong asymmetry.
Lindner
Benjamin
B
Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Canada KIN 6N5.
Schimansky-Geier
Lutz
L