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DY: Fachverband Dynamik und Statistische Physik

DY 23: Reaction-Diffusion Systems

DY 23.6: Talk

Tuesday, March 17, 2015, 15:45–16:00, BH-N 243

Electrodissolution of silicon: Self-organized patterns in space and time — •Konrad Schönleber, Lennart Schmidt, and Katharina Krischer — TU München, Deutschland

The oscillatory electrodissolution of silicon in fluoride containing electrolytes has been studied for decades. Still many basic aspects concerning this system remain unknown, most prominently the mechanism giving rise to the oscillations.

In the present work, some key features of this oscillatory mechanism will be presented. It will be secifically shown that the system seems to have a built-in memory of its current state even when perturbed drastically.

For n-doped silicon, pattern formation is observed under limited illumination. Remarkably, these patterns often consist of different dynamical states coexisting on the electrode, the most striking example of which are the so-called 'chimera states'. The pattern formation can be well understood in theory, when treating the silicon as an oscillatory medium close to the onset of oscillations. A comparison of theoretical simulations and experiments will be given.