Dresden 2009 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 26: Poster II
DY 26.32: Poster
Donnerstag, 26. März 2009, 16:00–18:00, P1A
Rogue waves in microwave structures — Ruven Höhmann, •Ulrich Kuhl, and Hans-Jürgen Stöckmann — Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany
Microwave transport experiments have been performed in a quasi-two-dimensional resonator with inserted scatterers mimicking a r−2 repulsive potential. The flow emitted from a source antenna and passing through the scattering arrangement show similar branching structures as known from scanning probe microscopy experiments in quantum point contact structures for the electron flow [1]. The branches follow the slopes of the potential but not the valleys, showing that caustics are responsible for the observed structures [2]. Particular conspicuous features observed in the stationary patterns are “hot spots” with intensities by far beyond those expected in a random wave field. Reinterpreting the flow patterns as wave patterns developing in the sea in the presence of spatially varying velocity fields freak or rogue waves occur much more often even in a linear system.
[1] M. A. Topinka, et al., Nature 410, 183 (2001).
[2] L. Kaplan, Phys. Rev. Lett. 89, 184103 (2002).