Topologically protected colloidal transport above a square magnetic lattice

We theoretically study the motion of magnetic colloidal particles above a magnetic pattern and compare the predictions with Brownian dynamics simulations. The pattern consists of alternating square domains of positive and negative magnetization. The colloidal motion is driven by periodic modulation...

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Bibliographic Details
Published in:New journal of physics 2016-10, Vol.18 (10), p.105009
Main Authors: Heras, Daniel de las, Loehr, Johannes, Loenne, Michael, Fischer, Thomas M
Format: Article
Language:English
Subjects:
Colloids
four-fold symmetry
lattice
Physics
topology
Transport
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Summary:We theoretically study the motion of magnetic colloidal particles above a magnetic pattern and compare the predictions with Brownian dynamics simulations. The pattern consists of alternating square domains of positive and negative magnetization. The colloidal motion is driven by periodic modulation loops of an external magnetic field. There exist loops that induce topologically protected colloidal transport between two different unit cells of the pattern. The transport is very robust against internal and external perturbations. Theory and simulations are in perfect agreement. Our theory is applicable to other systems with the same symmetry.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/18/10/105009