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DY: Fachverband Dynamik und Statistische Physik

DY 28: Pattern Formation and Reaction-Diffusion Systems

DY 28.9: Vortrag

Dienstag, 17. März 2020, 12:15–12:30, ZEU 147

Periodic patterns emerge beyond active phase separation — •Frederik J. Thomsen, Lisa Rapp, Fabian Bergmann, and Walter Zimmermann — Theoretische Physik, Universität Bayreuth

A generic model for a conserved order-parameter field is suggested and investigated that shows a primary transition to large-scale active phase separation. It is a first example of a nonlinear conserved system that shows a secondary bifurcation to spatially periodic patterns. The transition is hysteretic. This spatially periodic patterns show multistability, i. e. we find wavenumber bands of stable periodic patterns as in classial pattern forming systems with unconserved order parameter fields. In a certain parameter subrange this model follows a gradient dynamics. In this range and in its neighborhood homogeneous phase separated states coexist with spatially periodic patterns.