Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Brownian Motion and Transport
DY 25.4: Vortrag
Donnerstag, 29. März 2012, 10:30–10:45, MA 004
One-dimensional transport and control in an interacting colloidal system — •Robert Gernert and Sabine H.L. Klapp — Institut für theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
We consider a non-equilibrium system of interacting colloids driven by a constant force through a periodic, symmetric washboard potential1. As a framework for solving the overdamped equation of motion for the time-dependent density profile, we employ the Dynamical Density Functional Theory (DDFT), where the microscopic particle interactions enter via a free energy functional.
Transport properties such as density profiles, mean-squared displacement2 and the diffusion coefficient are investigated in dependence of the interaction. In particular, we investigate the impact of interactions on the formation of plateaus in the mean-squared displacement and on the so-called giant diffusion effect. Furthermore a feedback control is presented allowing the transport of particles in a package.
Our study shows that the DDFT is capable of describing cage effects as well as motion under driving forces and the impact of feedback control3.
1 Lichtner K. and Klapp S.H.L., EPL 92 (2010) 40007
2 Reimann P., Van den Broeck C., Linke H., Hänggi P., Rubi J.M. and Pérez-Madrid A., Phys. Rev. Lett. 87 (2001) 010602
3 Gernert R., Lichtner K., Schirok D. and Klapp S.H.L., in preparation