Feedback-controlled transport in an interacting colloidal system

Details Feedback-controlled transport in an interacting colloidal system Feedback-controlled transport in an interacting colloidal system

2010-08-23

arxiv.org/abs/1008.3862v2

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 5 figures

Scientific paper

Based on dynamical density functional theory (DDFT) we consider a non-equilibrium system of interacting colloidal particles driven by a constant tilting force through a periodic, symmetric "washboard" potential. We demonstrate that, despite of pronounced spatio-temporal correlations, the particle current can be reversed by adding suitable feedback control terms to the DDFT equation of motion. We explore two distinct control protocols with time delay, focussing on either the particle positions or the density profile. Our study shows that the DDFT is an appropriate framework to implement time-delayed feedback control strategies widely used in other fields of nonlinear physics

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