Dynamic regimes for driven colloidal particles on a periodic substrate at commensurate and incommensurate fillings
Abstract
We numerically examine colloidal particles driven over a muffin tin substrate. Previous studies of this model identified a variety of commensurate and incommensurate static phases in which topological defects can form domain walls, ordered stripes, superlattices, or disordered patchy regimes as a function of the filling fraction. Here, we show that the addition of an external drive to these static phases can produce distinct dynamical responses. At incommensurate fillings the flow occurs in the form of localized pulses or solitons correlated with topological defect structures. Transitions between different modes of motion can occur as a function of increasing drive. We measure the average particle velocity for specific ranges of external drive and show that changes in the velocity response correlate with changes in the topological defect arrangements. We also demonstrate that in the different dynamic phases, the particles have distinct trajectories and velocity distributions. Dynamic transitions between ordered and disordered flows exhibit hysteresis, while in strongly disordered regimes there is no hysteresis and the velocity-force curves are smooth. When stripe patterns are present, transport can occur at an angle to the driving direction.
Additional Information
© 2013 American Physical Society. Received 7 June 2013; published 2 December 2013. This work was carried out under the auspices of the NNSA of the US DoE at LANL under Contract No. DE-AC52-06NA25396. D.M. and J.A. received support from the ASC Summer Workshop program at LANL.Attached Files
Published - PhysRevE.88.062301.pdf
Submitted - 1306.1785v1.pdf
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Additional details
- Eprint ID
- 43450
- Resolver ID
- CaltechAUTHORS:20140121-100641471
- DE-AC52-06NA25396
- Department of Energy (DOE)
- Los Alamos National Lab (LANL) ASC Summer Workshop Program
- Created
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2014-01-22Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field