Berlin 2015 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 62: Poster - Dynamics

DY 62.21: Poster

Donnerstag, 19. März 2015, 16:00–18:00, Poster A

Influence of spatio-temporal modulations on the orientation of stripe patterns — •Lisa Rapp, Vanessa Weith, Alexei Krekhov, and Walter Zimmermann — Theoretische Physik, Universität Bayreuth, Bayreuth

Labyrinth-like stripe patterns occur in a variety of isotropic systems from chemical reactions, thermal convection and vegetation patterns to diblock copolymers. For a deeper understanding of the dynamics of patterns as well as for many technical applications, however, the control of the stripe patterns is important. We show that spatiotemporal modulations are an effective mechanism to control the pattern morphology. Using traveling, large modulation wavelengths compared to the intrinsic periodicity of the pattern, labyrinth-like patterns can be straightened in favor of regular stripe patterns. The orientation of the stripes can be controlled and selected by varying the velocity of the traveling modulation. In systems with broken symmetries long-wavelength modulations can be used to suppress other patterns such as hexagons or squares in favor of stripe patterns. To support the results obtained from linear stability analysis, we quantitatively analyze simulations of the two-dimensional Swift-Hohenberg model with regard to the distributions of local orientation angles of the stripes.