Inertia ratchets: A numerical study versus theory
نویسندگان
چکیده
The colored ~Ornstein-Uhlenbeck! noise-driven nonequilibrium dynamics of massive damped Brownian particles in a periodic but asymmetric potential ~ratchet! is investigated. Our special focus is on the influence of inertia in the particle dynamics for the noise induced, directed current. By means of two approximation schemes ~a unified colored noise approximation and a path-integral approach! and by numerical matrixcontinued-fraction evaluations of the inherent, three-dimensional Fokker-Planck dynamics as well as by direct simulations of the stochastic differential equations we examine the dynamics at various inertial strengths. For the case of a large mass we find current reversal with respect to both a variation of the mass and of the noise-correlation time. Possibilities for efficient mass-sensitive scenarios for separation of particles are discussed. @S1063-651X~99!00802-8#
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