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DY: Fachverband Dynamik und Statistische Physik
DY 61: Brownian Motion and Anomalous Transport
DY 61.5: Talk
Friday, March 13, 2026, 10:30–10:45, ZEU/0118
Current reversals in periodically driven many-particle colloidal ratchet — •Seemant Mishra1, David Vorac2, Artem Ryabov2, and Philipp Maass1 — 1Universität Osnabrück, Institut für Physik, Germany — 2Charles University, Faculty of Mathematics and Physics, Czech Republic
We study a many-particle colloidal ratchet and demonstrate the occurrence of current reversals under a symmetric, time-periodic driving force. An overcrowding of particles in the potential wells of the ratchet causes the current to be mediated by propagating solitary waves [1,2]. The current reversals arise from distinct modes of these waves. By a mapping onto a quasiparticle dynamics [3] and applying a unit-displacement law [4], we develop an analytic theory for the particle currents as function of the driving parameters and explain the occurrence of the current reversals. We further examine the role of hydrodynamic interactions in the system.
[1] A. P. Antonov, A. Ryabov, P. Maass, Phys. Rev. Lett. 129, 080601
[1] (2022).
[2] E. Cereceda-López, A. P. Antonov, A. Ryabov, P. Maass, and
[1] P. Tierno, Nat. Commun. 14, 6448 (2023).
[3] S. Mishra, A. Ryabov, P. Maass, Phys. Rev. Lett. 134, 107102
[1] (2025).
[4] A. P. Antonov, A. Vonhusen, A. Ryabov, P. Maass, Nonlinear Dyn.
[1] 113, 31529 (2025).
Keywords: Solitons; Cluster waves; Brownian ratchet; Current reversals; Driven colloids