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Title: Regulating wave front dynamics from the strongly discrete to the continuum limit in magnetically driven colloidal systems
Author: Martinez Pedrero, Fernando
Tierno, Pietro
Johansen, Tom H.
Straube, Arthur
Keywords: Matèria condensada
Condensed matter
Issue Date: 3-Feb-2016
Publisher: Nature Publishing Group
Abstract: The emergence of wave fronts in dissipative driven systems is a fascinating phenomenon which can be found in a broad range of physical and biological disciplines. Here we report the direct experimental observation of discrete fronts propagating along chains of paramagnetic colloidal particles, the latter propelled above a traveling wave potential generated by a structured magnetic substrate. We develop a rigorously reduced theoretical framework and describe the dynamics of the system in terms of a generalized one-dimensional dissipative Frenkel-Kontorova model. The front dynamics is explored in a wide range of field parameters close to and far from depinning, where the discrete and continuum limits apply. We show how symmetry breaking and finite size of chains are used to control the direction of front propagation, a universal feature relevant to different systems and important for real applications.
Note: Reproducció del document publicat a:
It is part of: Scientific Reports, 2016, vol. 6, p. 19932-1-19932-10
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ISSN: 2045-2322
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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