Points, Walls and Loops in Resonant Oscillatory Media

Nonlinear Sciences – Pattern Formation and Solitons

Scientific paper

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9 pages (revtex format) and 6 figures (PostScript)

Scientific paper

10.1103/PhysRevLett.75.3768

In an experiment of oscillatory media, domains and walls are formed under the parametric resonance with a frequency double the natural one. In this bi-stable system, %phase jumps $\pi$ by crossing walls. a nonequilibrium transition from Ising wall to Bloch wall consistent with prediction is confirmed experimentally. The Bloch wall moves in the direction determined by its chirality with a constant speed. As a new type of moving structure in two-dimension, a traveling loop consisting of two walls and Neel points is observed.

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