Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 27: Quantum chaos II
DY 27.8: Vortrag
Donnerstag, 28. Februar 2008, 16:15–16:30, MA 004
Friedel oscillations in microwave billiards — Arnd Bäcker1, •Thomas Friedrich2, Maksim Miski-Oglu2, Achim Richter2, and Steven L. Tomsovic3 — 1Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany — 2Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany — 3Dept. of Physics, Washington State University, Pullman, WA
Oscillations of the electronic wave function in the neighborhood of defect atoms or potential steps in metallic surfaces (so-called Friedel oscillations) are known for a long time. Scanning tunnelling microscopy brought up breathtaking pictures such as the well known quantum corrals where this phenomenon is visualized. We investigate the properties of Friedel oscillations in the experiment using two flat microwave billiards, the mushroom billiard with mixed dynamics and a pseudointegrable barrier billiard. The average of the field distributions of eigenmodes below the Fermi energy exhibits oscillations close to the boundary. We compare them with predictions of the random plane wave model. Taking into account the structure of the classical phase space, we find a good agreement.