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Dynamic regimes for driven colloidal particles on a periodic substrate at commensurate and incommensurate fillings

McDermott, D. and Amelang, J. and Reichhardt, C. J. Olson and Reichhardt, C. (2013) Dynamic regimes for driven colloidal particles on a periodic substrate at commensurate and incommensurate fillings. Physical Review E, 88 (6). Art. No. 062301. ISSN 1539-3755.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription 10.1103/PhysRevE.88.062301DOIArticle Paper
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.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC52-06NA25396
Los Alamos National Lab (LANL) ASC Summer Workshop ProgramUNSPECIFIED
Issue or Number:6
Classification Code:PACS: 82.70.Dd, 83.80.Hj
Record Number:CaltechAUTHORS:20140121-100641471
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43450
Deposited By: Jason Perez
Deposited On:22 Jan 2014 17:02
Last Modified:03 Oct 2019 06:07

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