SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 27: Statistical Physics: Far From Equilibrium I

DY 27.10: Vortrag

Mittwoch, 29. März 2023, 12:15–12:30, ZEU 250

Nonequilibrium probability currents in optically-driven colloidal suspensions — •Samudrajit Thapa1,2, Daniel Zaretzky3, Grzegorz Gradziuk4, Chase Broedersz4,5, Yair Shokef1,2,6, and Yael Roichman3,6,71School of Mechanical Engineering, Tel Aviv University, Tel Aviv 69978, Israel — 2Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel — 3School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel — 4Arnold Sommerfeld Center for Theoretical Physics, Ludwig Maximilians Universitaet Muenchen, Theresienstr. 37, 80333 Munich, Germany — 5Department of Physics and Astronomy, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands — 6Center for the Physics and Chemistry of Living Systems, Tel Aviv University, 69978, Tel Aviv, Israel — 7School of Physics & Astronomy, Tel Aviv University, Tel Aviv 69978, Israel

In the absence of visible currents and prior knowledge, it is often hard to recognize athermal fluctuations. Probability currents provide such a measure in terms of the rate at which they enclose area in phase space. We measure this area enclosing rate for trapped colloidal particles, where only one particle is driven, and they interact hydrodynamically. By combining experiment, theory and simulation, we identify an optimal measurement protocol in terms of the relations between the different time scales in the system. Furthermore, we find that hydrodynamic interactions render the effect of athermal agitation more local than that of elastic interactions. This may have significant implications for the interpretation of fluctuations in biological systems.

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