Time asymmetry of the Kramers equation with nonlinear friction: fluctuation-dissipation relation and ratchet effect.


We show by numerical simulations that the presence of nonlinear velocity-dependent friction forces can induce a finite net drift in the stochastic motion of a particle in contact with an equilibrium thermal bath and in an asymmetric periodic spatial potential. In particular, we study the Kramers equation for a particle subjected to Coulomb friction, namely… (More)


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