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DY: Fachverband Dynamik und Statistische Physik

DY 35: Reaction-Diffusion Systems

DY 35.9: Vortrag

Donnerstag, 3. April 2014, 17:15–17:30, HÜL 186

Photoelectrodissolution of n-type silicon: An oscillatory medium with unusual pattern formation — •Konrad Schönleber, Andreas Heinrich, Elmar Miterreiter, Martin Wiegand, Carla Zensen, and Katharina Krischer — Technische Universität München

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 appropriate parameter values while the total current and spatially averaged oxide thickness oscillate simply periodic. The observed patterns typically consist of several regions on the electrode each showing distinct dynamical behavior giving rise to a rich variety of different states, as e.g. so-called 'Chimera states' and other unusual cluster states. In addition, a novel type of spatial organization involving periodically growing and collapsing oscillating domains with peculiar front dynamics are discussed.