Abstract
We study the spatiotemporal dynamics of the oscillatory photoelectrodissolution of n-type Si in a fluoride-containing electrolyte under anodic potentials using insitu ellipsometric imaging. When lowering the illumination intensity stepwise, we successively observe uniform oscillations, modulated amplitude clusters, and the coexistence of multifrequency clusters, i.e., regions with different frequencies, with a stationary domain. We argue that the multifrequency clusters emerge due to an adaptive, nonlinear, and nonlocal coupling, similar to those found in the context of neural dynamics.
Highlights
We study the spatiotemporal dynamics of the oscillatory photoelectrodissolution of n-type Si in a fluoride-containing electrolyte under anodic potentials using in situ ellipsometric imaging
Much of the dynamics of oscillating systems as diverse as neural activities [1], electrical power grids [2], multimode lasers [3], and Josephson junction arrays [4] can be understood within the common framework of networks of coupled oscillators
These diverse applications render the study of coupled oscillators an important discipline of nonlinear dynamics
Summary
We study the spatiotemporal dynamics of the oscillatory photoelectrodissolution of n-type Si in a fluoride-containing electrolyte under anodic potentials using in situ ellipsometric imaging. The case of global nonlinear coupling has been found to produce self-organized quasiperiodicity in ensembles of phase oscillators [5], complex chimera states composed of (nearly) synchronized regions of different mean frequencies and incoherent regions [14], or a variety of coexistence patterns, including again chimera states [9,10,11,12]. In this Letter, we report the emergence of self-organized multifrequency clusters from a uniform oscillatory state during the photoelectrodissolution of an n-Si wafer when reducing the illumination intensity.
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