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Title: Collective directional locking of colloidal monolayers on a periodic substrate
Author: Stoop, Ralph L.
Straube, Arthur V.
Johansen, Tom H.
Tierno, Pietro
Keywords: Col·loides
Matèria condensada tova
Soft condensed matter
Issue Date: 4-Feb-2020
Publisher: American Physical Society
Abstract: We investigate the directional locking effects that arise when a monolayer of paramagnetic colloidal particles is driven across a triangular lattice of magnetic bubbles. We use an external rotating magnetic field to generate a two-dimensional traveling wave ratchet forcing the transport of particles along a direction that intersects two crystallographic axes of the lattice. We find that, while single particles show no preferred direction, collective effects induce transversal current and directional locking at high density via a spontaneous symmetry breaking. The colloidal current may be polarized via an additional bias field that makes one transport direction energetically preferred.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2020, vol. 124, num. 5, p. 058002
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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