Collective Directional Locking of Colloidal Monolayers on a Periodic Substrate.

Autor:	Stoop RL; Departament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, Spain., Straube AV; Departament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, Spain.; Department of Mathematics and Computer Science, Freie Universität Berlin, 14195 Berlin, Germany.; Group 'Dynamics of Complex Materials', Zuse Institute Berlin, 14195 Berlin, Germany., Johansen TH; Department of Physics, University of Oslo, P. O. Box 1048 Blindern, 0316 Oslo, Norway.; Institute for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia., Tierno P; Departament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, Spain.; Universitat de Barcelona Institute of Complex Systems (UBICS), Universitat de Barcelona, 08028 Barcelona, Spain.; Institut de Nanociència i Nanotecnologia, IN2UB, Universitat de Barcelona, 08028 Barcelona, Spain.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2020 Feb 07; Vol. 124 (5), pp. 058002.
DOI:	10.1103/PhysRevLett.124.058002
Abstrakt:	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.
Databáze:	MEDLINE
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