Berlin 2024 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Poster: Active Matter, Soft Matter, Fluids
DY 32.21: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster C
Force-Free and Autonomous Active Brownian Ratchets — •Constantin Rein1, Klaus Kroy1, and Viktor Holubec2 — 1Universität Leipzig, Institut für theoretische Physik, Brüderstraße 16, 04109 Leipzig — 2Charles University Prague, Department of Macromolecular Physics, V Holešovičkách 747/2, Praha 8
We present the recently found force-free activity ratchet, that rectifies active Brownian motion using solely time-independent activity landscapes (Rein2023,doi.org/10.1209/0295-5075/accca5). 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. The poster presents a full exploration of the properties and working mechanism of the ratchet and its response to external forcing, with an outlook on similarities to transport phenomena in rarefied gases.
Keywords: Brownian Ratchet; Active Matter; Noise rectification; microswimmers; active brownian particle