Pumping single-file colloids: Absence of current reversal

Chaudhuri, Debasish and Archishman, R and Dhar, A (2015) Pumping single-file colloids: Absence of current reversal. Physical Review E, 91 (5). ISSN 1539-3755

Full text not available from this repository. (Request a copy)

Abstract

We consider the single-file motion of colloidal particles interacting via short-range repulsion and placed in a traveling wave potential that varies periodically in time and space. Under suitable driving conditions, a directed time-averaged flow of colloids is generated. We obtain analytic results for the model using a perturbative approach to solve the Fokker-Planck equations. The predictions show good agreement with numerical simulations. We find peaks in the time-averaged directed current as a function of driving frequency, wavelength, and particle density and discuss possible experimental realizations. Surprisingly, unlike a closely related exclusion dynamics on a lattice, the directed current in the present model does not show current reversal with density. A linear response formula relating current response to equilibrium correlations is also proposed.

[error in script]

IITH Creators: