Regensburg 2022 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 46: Poster Session: Complex Fluids, Soft Matter, Active Matter, Glasses and Granular Materials

DY 46.4: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P2

Inertial Active Particles in Unbiased ac Fields Sediment at the Top Wall — •José Carlos Ureña Marcos and Benno Liebchen — Institut für Physik Kondensierter Materie, Technische Universität Darmstadt, Darmstadt, Germany

A detailed understanding of the controllability of the swimming direction of active particles through external fields is crucial for many of their proposed future applications, from nanomedicine to bioapplications.

While such steering is often achieved with dc fields with a net gradient, we show in this work that the use of rapidly oscillating ac fields allows the steering of inertial active particles even in the absence of a net gradient. To demonstrate this, we develop an analytical framework which shows that fast ac fields can stabilise fixed points in the dynamics of active particles which would otherwise be unstable.

To exemplify the applicability of this scheme, we explore inertial active particles in a gravitational field and observe that, in the presence of a rapidly oscillating ac field, a substantial fraction of them persistently travel in the upward direction and sediment at the top wall of the simulation box.