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DY: Fachverband Dynamik und Statistische Physik

DY 24: Granular matter II

DY 24.2: Talk

Thursday, February 28, 2008, 10:15–10:30, MA 004

Phase separation in driven granular systems — •Nathan Isert, Corinna Maaß, Christof Aegerter, and Georg Maret — Universität Konstanz, Germany

Granular matter can show counterintuitive behavior, such as a separation induced by undirected shaking, a phenomenon known as Maxwell's demon. In the theoretical description of this effect, gravity plays an important role for the prediction of the observed bifurcation. Here, we investigate this role of gravity directly, by altered gravity up to a microgravity environment using diamagnetic levitation of grains. Our results show profound differences in the gravity dependence when compared to the predicted bifurcations, thereby strongly suggesting a modification of the present theoretical approach.