Ratchet transport systems are widespread in physics and biology; however, the effect of the dispersing medium in the collective dynamics of these out-of-equilibrium systems has been often overlooked. We show that, in a traveling wave magnetic ratchet, long-range hydrodynamic interactions (HIs) produce a series of remarkable phenomena on the transport and assembly of interacting Brownian particles. We demonstrate that HIs induce the resynchronization with the traveling wave that emerges as a “speed-up” effect, characterized by a net raise of the translational speed, which doubles that of single particles. When competing with dipolar forces and the underlying substrate symmetry, HIs promote the formation of clusters that grow perpendicular to the driving direction. We support our findings both with Langevin dynamics and with a theoretical model that accounts for the fluid-mediated interactions. Our work illustrates the role of the dispersing medium on the dynamics of driven colloidal matter and unveils the growing process and cluster morphologies above a periodic substrate.
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We thank T. H. Johansen for providing us the FGF film.
Funding:
This work has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme (grant agreement no. 811234). S.G.L. and I.P. acknowledge support from Horizon 2020 program through 766972-FET-OPEN-NANOPHLOW. R.L.S. acknowledges support from the Swiss National Science Foundation (grant 180729). I.P. acknowledges support from Ministerio de Ciencia, Innovación y Universidades (grant no. PGC2018-098373-B-100 AEI/FEDER-EU) and from Generalitat de Catalunya under project 2017SGR-884 and Swiss National Science Foundation project no. 200021-175719. P.T. acknowledges support from Ministerio de Ciencia, Innovación y Universidades (PID2019-108842GB-C21) and the Generalitat de Catalunya (ICREA Acadèmia).
Author contributions:
S.G.L. performed numerical simulations and theory. R.L.S. carried out the experiments. I.P. and P.T. supervised the work. All authors discussed and interpreted the result of the manuscript.
Competing interests:
The authors declare that they have no competing interests.
Data and materials availability:
All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials.
Departament de Física de la Matèria Condensada, Universitat de Barcelona, Barcelona, Spain.
Universitat de Barcelona Institute of Complex Systems (UBICS), Universitat de Barcelona, Barcelona 08028, Spain.
CECAM, Centre Européen de Calcul Atomique et Moléculaire, École Polytechnique Fédérale de Lausanne, Batochime, Avenue Forel 2, 1015 Lausanne, Switzerland.
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