Dresden 2014 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 28: Extreme Events

DY 28.2: Vortrag

Donnerstag, 3. April 2014, 09:45–10:00, ZEU 146

Experimental Observation of a Fundamental Length Scale of Waves in Random Media — •Sonja Barkhofen^5,1, Jakob Metzger^2,3, Ragnar Fleischmann², Ulrich Kuhl^4,1, and Hans-Jürgen Stöckmann¹ — ¹Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, 35032 Marburg, Germany — ²Max-Planck-Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077 Göttingen, Germany — ³Institute for Nonlinear Dynamics, Department of Physics, University of Göttingen, 37077 Göttingen, Germany — ⁴LPMC, CNRS UMR 7336, Université de Nice Sophia-Antipolis, F-06108 Nice, France — ⁵Applied Physics, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany

Waves propagating through a weakly scattering random medium show a pronounced branching of the flow accompanied by the formation of freak waves, i.e. extremely intense waves. Theory predicts that this strong fluctuation regime is accompanied by its own fundamental length scale of transport in random media, parametrically different from the mean free path or the localization length. We report the experimental observation of this scaling using microwave transport experiments in quasi-two dimensional resonators with randomly distributed weak scatterers. Remarkably, the scaling range extends much further than expected from random caustics statistics.