2026-04-17T01:49:54Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1589462025-12-04T20:44:02Zcom_2072_1057col_2072_478822col_2072_478917

00925njm 22002777a 4500 dc Stoop, Ralph L. author Straube, Arthur V. author Johansen, Tom H. author Tierno, Pietro author 2020-05-06T14:18:35Z 2020-05-06T14:18:35Z 2020-02-04 2020-05-06T14:18:35Z 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. Col·loides Matèria condensada tova Colloids Soft condensed matter Collective directional locking of colloidal monolayers on a periodic substrate