| Autor: |
Leyva SG; 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., Stoop RL; Departament de Física de la Matèria Condensada, Universitat de Barcelona, Barcelona, Spain., Pagonabarraga I; 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., Tierno P; 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.; Institut de Nanociència i Nanotecnologia, IN2UB, Universitat de Barcelona, Barcelona, Spain. |
| Abstrakt: |
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. |
