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DY: Fachverband Dynamik und Statistische Physik

DY 43: Poster: Statistical Physics

DY 43.5: Poster

Mittwoch, 11. März 2026, 15:00–18:00, P5

Quantifying stochastic resonance in bistable systems: a new measure based on passive observation — •Christian Muñoz¹, Bart Vos¹, Till Münker¹, Dorian Marx¹, Matthias Krüger², and Timo Betz¹ — ¹Third Institute of Physics - Biophysics, Georg August University Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — ²Institut für Theoretische Physik, Georg August University Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Stochastic resonance (SR) is a noise-assisted phenomenon of broad relevance whose complexity motivates its study in simple and controllable systems. In this work, SR is investigated using a single Brownian particle confined in a bistable potential created with optical tweezers. In such a system, SR emerges from the interplay between thermal fluctuations and the periodic modulation of the potential landscape. First, several well-established approaches from literature are revised to determine under which conditions SR is enhanced. In particular, the strength of the first peak of the residence time distribution displays a clear maximum. Additionally, we propose a new protocol to quantify SR based on the novel quantity of the mean back relaxation (MBR). The new quantifier, which measures the amplitude of the oscillations that MBR displays, shows quantitative agreement with the average work done by the system. Our findings may provide a new approach for analyzing the stochastic energetics of a system by mere passive observation.

Keywords: Optical tweezers; Stochastic resonance; Brownian dynamics; Stochastic thermodynamics