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DY: Fachverband Dynamik und Statistische Physik
DY 25: Active Matter III (joint session DY/BP/CPP)
DY 25.9: Talk
Wednesday, March 20, 2024, 12:00–12:15, BH-N 334
Long-range fluctuation-induced forces in chiral active fluids — Hashem Fatemi1, Hamidreza Khalilian1, Jalal Sarabadani1, and •Reza Shaebani2 — 1Institute for Research in Fundamental Sciences (IPM), Iran — 2Department of Theoretical Physics, Saarland University, Germany
We study long-range fluctuation-induced (FI) interactions in chiral active matter systems. We show that the combination of self-rotation and self-propulsion can lead to large FI forces, depending on the elongation of active particles. Such strong forces can contribute to self-organization of chiral active matter into dynamic structures and patterns. We numerically measure the FI forces between intruders immersed in chiral active fluids and find that the influence of chirality depends on the particle elongation in the active bath. For round active objects, the FI force monotonically decreases with increasing chirality since the active bath structure gradually changes from rotating flocks and vortices to localized spinners. Contrarily, for elongated active objects there is an optimal chiral angle at which the magnitude and range of the FI interaction are maximized. We explain how the balance of collisions around the intruders varies with chirality and separation between the intruders.
Keywords: chiral active matter; fluctuation-induced forces; long-range interactions; structure formation