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

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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.

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IITH Creators:
IITH CreatorsORCiD
Chaudhuri, DebasishUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Fokker-Planck,
Subjects: Physics
Divisions: Department of Physics
Depositing User: Library Staff
Date Deposited: 21 May 2015 07:07
Last Modified: 30 Aug 2017 10:57
URI: http://raiith.iith.ac.in/id/eprint/1518
Publisher URL: https://doi.org/10.1103/PhysRevE.91.050103
OA policy: http://www.sherpa.ac.uk/romeo/issn/1539-3755/
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