Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Nonlinear Dynamics, Synchronization and Chaos I

DY 12.8: Vortrag

Dienstag, 12. März 2013, 11:30–11:45, H48

Spontaneous formation of chimera states and other cluster patterns under strong global coupling: experiment — •Konrad Schönleber, Andreas Heinrich, Carla Zensen, Lennart Schmidt, Vladimir Garcia-Morales, and Katharina Krischer — Technische Universität München, Garching, Deutschland

We investigate the spatial thickness distribution of oxide layers formed at illuminated n-type silicon samples during the anodic electrodissolution in fluoride containing electrolytes by means of spatially resolved ellipsometric imaging. Spontaneous pattern formation in the oxide thickness can be observed for intermediate illumination strengths while the total current and spatially averaged oxide thickness oscillate simply periodic. The patterns are typically cluster patterns where the electrode splits into several domains showing different oscillatory behavior for example subharmonic clusters or chimera states. These patterns are well captured by a modified Ginzburg-Landau equation with nonlinear global coupling. In addition, a novel type of spatial organization involving periodically growing and collapsing oscillating domains with peculiar front dynamics are discussed.