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DY: Fachverband Dynamik und Statistische Physik

DY 33: Poster II

DY 33.4: Poster

Donnerstag, 14. März 2013, 17:00–19:00, Poster C

Ratchet effects in magnetic colloidal suspensions — •Teresa Reinhard and Sabine H. L. Klapp — Institut für Theoretische Physik, TU Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany

We consider a system of dipolar colloids driven by an oscillating magnetic field. Specifically, the regarded field is lacking net rotating components and puts the system in an out-of-equilibrium state. In such a nonequilibrium system the microscopic Brownian motion can result in directed rotational macroscopic motions [1]. This process, which is called the ratchet effect, is analysed on the basis of the dynamical density functional theory. Specifically, we investigate the impact of a dipole-dipole interaction and compare our results with those from a mean-field Fokker-Planck approach [2] and from particle-based computer simulations [3].

[1] A. Engel and P. Reimann, Phys. Rev. Let. 91, 060602 (2003).

[2] V. Becker and A. Engel Phys. Rev. E 75, 031118 (2007).

[3] S. Jäger and S. H. L. Klapp, submitted, arXiv:1210.3479 (2012).