Structural transitions and dynamical regimes for directional locking of vortices and colloids driven over periodic substrates

Journal of Physics. Condensed Matter : an Institute of Physics Journal
C Reichhardt, C Reichhardt

Abstract

We examine collective dynamical locking effects for superconducting vortices and colloids interacting with square and triangular substrate arrays under a slowly rotated dc drive. A rich variety of lattice configurations associated with a series of steps in the velocity-force curves occur during the locking transitions. These include triangular, square, smectic, and disordered particle arrangements that can be identified using the structure factor. We show that the step widths vary with the ratio of the number of particles to the number of pinning sites. Unlike a static system, where matching effects occur at simple integer commensuration ratios, we find dynamical commensuration effects that arise when an integer number of particle chains flow between rows of pins. We identify two distinct types of locking as a function of substrate strength, distinguished by whether the particles flow along or between the pinning rows.

References

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Citations

Mar 21, 2013·The European Physical Journal. E, Soft Matter·Justus A KromerHolger Stark
Feb 4, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·D McDermottC Reichhardt
May 30, 2020·Soft Matter·Prairie Wentworth-NiceAmy L Graves
Apr 30, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J HasnainC Dellago
Nov 21, 2020·Physical Review. E·C Reichhardt, C J O Reichhardt
Aug 15, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Sumedh R Risbud, German Drazer
Sep 18, 2020·Nature Communications·Andrea VanossiMichael Urbakh
May 13, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·N P VizarimP A Venegas

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