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Transverse dichotomic ratchet in a two-dimensional corrugated channel

Pavol Kalinay

  • Institute of Physics, Slovak Academy of Sciences, Dúbravska cesta 9, 84511, Bratislava, Slovakia

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Phys. Rev. E 106, 044126 – Published 17 October, 2022

DOI: https://doi.org/10.1103/PhysRevE.106.044126

Abstract

A particle diffusing in a two-dimensional channel of varying width h(x) is considered. It is driven by a force of constant magnitude f, but random orientation across the channel. We suggest the projection technique to study the ratchet effect appearing in this system. Reducing the transverse coordinate, as well as the orientation of the force in the full-dimensional Fokker-Planck equation, we arrive at the generalized Fick-Jacobs equation, describing dynamics of the system in the longitudinal coordinate x only. The additional effective potential −γ(x), calculated within the mapping procedure, exhibits an increasing or decreasing part in the channel shaped by an asymmetric periodic h(x), which determines the appearing ratchet current. As shown on a specific example, random driving in the transverse direction is much more effective than that in the longitudinal direction, at least for quickly flipping orientation of the force. Also, the transverse and the longitudinal driving push the rectified current in opposite directions along the same channel.

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Information

Phys. Rev. E 106, 044126– Published 17 October, 2022
  • Received 29 June 2022
  • Accepted 23 September 2022
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