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• W2087207893 abstract "The one-dimensional overdamped Brownian motion of a dimer consisting of two harmonically interacting components is considered. Both components are coupled to the same heat bath and feel the same spatially periodic symmetric potential, whose amplitude is modulated periodically in time. The friction coefficients may differ between dimer components, thus breaking the dynamical symmetry of the system. In the absence of any external bias, a ratchet effect (directed transport) arises generically. Two accurate approximations for the dimer's velocity and diffusion coefficient are obtained for weak and strong couplings. The velocity of the system can be maximized for each direction by adding an optimal amount of noise and by tuning the driving frequency to an optimal value. Furthermore, there exist two optimal coupling strengths at which the velocity is the largest." @default.
• W2087207893 created "2016-06-24" @default.
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• W2087207893 date "2009-03-19" @default.
• W2087207893 modified "2023-10-02" @default.
• W2087207893 title "Ratchet effect of a dimer with broken friction symmetry in a symmetric potential" @default.
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• W2087207893 doi "https://doi.org/10.1103/physreve.79.031114" @default.
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