Regensburg 2013 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Poster II

DY 33.8: Poster

Thursday, March 14, 2013, 17:00–19:00, Poster C

Delaying motion in an one-dimensional colloidal system by feedback control — •Sarah Loos, Robert Gernert, and Sabine H. L. Klapp — Institut für Theoretische Physik, TU Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany

Using feedback control we manipulate the Brownian motion of a colloid in an external tilted sinusoidal potential in one dimension. The mean-squared-displacement (MSD) of the overdamped particle shows a plateau [1], [2]. To stretch this plateau we introduce a feedback control force, where the first moment of the probability density serves as the control target. Preliminary results suggest that this causes a second plateau. We investigate the system by numerically solving the Fokker-Planck-Equation. We further develop a time delayed feedback control as another method to stretch the MSD.

[1] Cecile Dalle-Ferrier, Matthias Krüger, Richard D. L. Hanes, Stefan Walta, Matthew C. Jenkins and Stefan U. Egelhaaf, Soft Matter 7, 2064 (2011)

[2] Clive Emary, Robert Gernert, Sabine H. L. Klapp, arXiv:1209.1504 [cond-mat.stat-mech] (2012)