Regensburg 2025 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 22: Poster: Statistical Physics
DY 22.6: Poster
Wednesday, March 19, 2025, 10:00–12:00, P3
The bath remembers: how many time-scales can we probe through recoil? — •Rupayan Saha1, Niloyendu Roy2, Debankur Das1, Clemens Bechinger2, and Matthias Krüger1 — 1Institute for Theoretical Physics, Georg-August-Universität Göttingen, Göttingen 37073, Germany — 2Fachbereich Physik, Universität Konstanz, Konstanz 78457, Germany
Recoil experiments, where one studies the transient dynamics of a colloidal particle after driving it externally, are of particular importance to gain insight into the non-Markovian properties prevalent in visoelastic solvents such as micellar suspensions. In an earlier experimental study by Félix Ginot et al. [New J. Phys. 24.12 (2022): 123013], the translational recoil was found to be governed by a small number of distinct time scales, reproduced by a microscopic model using a small number of so-called bath particles. In this contribution, we investigate orientational recoil of such a colloidal probe in a viscoelastic fluid, which, in contrast, appears to exhibit a large number of time scales. In collaboration with experiment, we develop microscopic models to account for such observations, and develop driving protocols to dissect the various time scales involved in this process.
Keywords: Non-equilibrium Statistical Physics; Non-Markovian Baths; Transient Dynamics; Time-dependent Phenomena; Microscopic Models