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DY: Fachverband Dynamik und Statistische Physik
DY 56: Poster - Statistical Physics
DY 56.22: Poster
Thursday, March 19, 2015, 16:00–18:00, Poster A
On the effect of the drive on self-organized criticality — Marco Winkler1, •Johannes Falk2, and Wolfgang Kinzel1 — 1Institute of Theoretical Physics, University of Würzburg, 97074 Würzburg, Germany — 2Institute for Condensed Matter Physics, Technical University of Darmstadt, 64289 Darmstadt, Germany
The well known Sandpile model of self-organized criticality generates avalanches of all length and time scales, without tuning any parameters. In the original models the external drive selects sites randomly. We analyse a drive which depends on the present state of the system, namely the effect of favouring sites with a certain height in the deposition process. We investigate, that the system stays in a critical state, if sites of height three are favoured. Our numerical results indicate the same universality class as the original model with random deposition, although the stationary state is approached very differently. In contrast, when favouring sites of height two, only avalanches which cover the entire system occur. Furthermore, we study the distributions of sites with a certain height, as well as the transient processes of the different variants of the external drive.