Dynamics of a dimer in a symmetric potential: Ratchet effect generated by an internal degree of freedom

von Gehlen S, Evstigneev M, Reimann P (2008)
Physical Review E 77(3): 031136.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
The one- dimensional dynamics of a dimer consisting of two harmonically coupled components is considered. The mutual distance between the dimer components plays the role of an internal degree of freedom. Both components are in contact with the same heat bath and are coupled to a spatially periodic, symmetric potential, whose amplitude is modulated periodically in time and whose coupling strength is different for the two components. In the absence of any external bias, a ratchet effect ( directed transport ) arises generically unless the mutual coupling of the dimer components tends to zero or infinity. In other words, the ratchet effect is generated by the internal degree of freedom. An accurate analytical approximation for the dimer's velocity and diffusion coefficient is obtained. The velocity of the system is maximized by adding an optimal amount of noise and by tuning the driving frequency to an optimal value. Furthermore, there exists an optimal coupling strength at which the velocity is the largest.
Erscheinungsjahr
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Physical Review E
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77
Zeitschriftennummer
3
Artikelnummer
031136
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von Gehlen S, Evstigneev M, Reimann P. Dynamics of a dimer in a symmetric potential: Ratchet effect generated by an internal degree of freedom. Physical Review E. 2008;77(3): 031136.
von Gehlen, S., Evstigneev, M., & Reimann, P. (2008). Dynamics of a dimer in a symmetric potential: Ratchet effect generated by an internal degree of freedom. Physical Review E, 77(3), 031136. doi:10.1103/PhysRevE.77.031136
von Gehlen, S., Evstigneev, M., and Reimann, P. (2008). Dynamics of a dimer in a symmetric potential: Ratchet effect generated by an internal degree of freedom. Physical Review E 77:031136.
von Gehlen, S., Evstigneev, M., & Reimann, P., 2008. Dynamics of a dimer in a symmetric potential: Ratchet effect generated by an internal degree of freedom. Physical Review E, 77(3): 031136.
S. von Gehlen, M. Evstigneev, and P. Reimann, “Dynamics of a dimer in a symmetric potential: Ratchet effect generated by an internal degree of freedom”, Physical Review E, vol. 77, 2008, : 031136.
von Gehlen, S., Evstigneev, M., Reimann, P.: Dynamics of a dimer in a symmetric potential: Ratchet effect generated by an internal degree of freedom. Physical Review E. 77, : 031136 (2008).
von Gehlen, Sebastian, Evstigneev, Mykhaylo, and Reimann, Peter. “Dynamics of a dimer in a symmetric potential: Ratchet effect generated by an internal degree of freedom”. Physical Review E 77.3 (2008): 031136.

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