SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 42: Poster: Active Matter, Soft Matter, Fluids

DY 42.11: Poster

Donnerstag, 30. März 2023, 13:00–16:00, P1

Force-free Ratcheting in Static Activity Landscapes — •Constantin Rein1, Martin Kolár2, Klaus Kroy1, and Viktor Holubec21Leipzig University, Faculty of Physics and Earth Sciences, Institute for Theoretical Physics, Brüderstraße 16, 04081 Leipzig — 2Charles University, Faculty of Mathematics and Physics, Department of Macromolecular Physics, V Holešovičkách 2, CZ-180 00 Praha

We study the possibility of rectifying active Brownian motion solely using time-independent activity landscapes. We argue that, in one dimension, spatially asymmetric activity does not suffice to induce directed transport, unless the activity is modulated in time or an additional potential is used, whereas, in higher dimensions, static activity landscapes alone can induce ratcheting. The underlying principle is similar to the ratcheting induced by asymmetric obstacles in microswimmer baths: swimmers with suitable orientations get channeled, while the others get trapped in low-activity regions until they lost their orientation. For landscapes with wedge-shaped low-activity regions, we numerically found an average transport velocity of the order of 1% of the particle's swim speed.

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