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Directed transport of confined Brownian particles with torque

Paul K. Radtke and Lutz Schimansky-Geier

  • Department of Physics, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany

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Phys. Rev. E 85, 051110 – Published 9 May, 2012

DOI: https://doi.org/10.1103/PhysRevE.85.051110

Abstract

We investigate the influence of an additional torque on the motion of Brownian particles confined in a channel geometry with varying width. The particles are driven by random fluctuations modeled by an Ornstein-Uhlenbeck process with given correlation time τc. The latter causes persistent motion and is implemented as (i) thermal noise in equilibrium and (ii) noisy propulsion in nonequilibrium. In the nonthermal process a directed transport emerges; its properties are studied in detail with respect to the correlation time, the torque, and the channel geometry. Eventually, the transport mechanism is traced back to a persistent sliding of particles along the even boundaries in contrast to scattered motion at uneven or rough ones.

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Information

Phys. Rev. E 85, 051110– Published 9 May, 2012
  • Received 24 January 2012

©2012 American Physical Society

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