Nonergodic Brownian Dynamics and the Fluctuation-Dissipation Theorem

Details Nonergodic Brownian Dynamics and the Fluctuation-Dissipation Theorem Nonergodic Brownian Dynamics and the Fluctuation-Dissipation Theorem

2006-05-03

arxiv.org/abs/cond-mat/0605093v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 2 figures

Scientific paper

Nonergodic Brownian motion is elucidated within the framework of the generalized Langevin equation. For thermal noise yielding either a vanishing or a divergent zero-frequency friction strength, the non-Markovian Browninan dynamics exhibits a riveting, anomalous diffusion behavior being characterized by a ballistic or possibly also a localized dynamics. As a consequence, such tailored thermal noise may cause a net acceleration of directed transport in a rocking Brownian motor. Two notable conditions for the thermal noise are identified in order to guarantee the fluctuation-dissipation theorem of first kind.

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