Berlin 2005 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 13: Quantum Chaos
DY 13.6: Vortrag
Freitag, 4. März 2005, 15:30–15:45, TU H2032
First experimental evidence for quantum echoes in scattering systems — •T. Friedrich1, B. Dietz1, H.-D. Gräf1, A. Heine1, C. Mejia-Monasterio2, M. Miski-Oglu1, A. Richter1 und T. H. Seligman3 — 1TU-Darmstadt, Institut für Kernphysik, Schlossgartenstr. 9, 64289 Darmstadt — 2Center for Nonlinear and Complex Systems, Como, Italy — 3Centro Internacional de Ciencias, Cuernavaca, Mexico
We investigated a scattering system with mixed dynamics and a large stable island in phase space. In those systems the dynamics in the interface between the stable island and the surrounding chaotic sea is described by a Smale horseshoe and a periodic response to an incoming pulse has been predicted theoretically. We observed for the first time this self-pulsing effect, termed quantum echoes, experimentally in an open superconducting microwave billiard [Phys. Rev. Lett. 93, 134102 (2004)]. The periods of the echoes can be related to the development stage of the horseshoe and therefore the quantum measurement provides information about the classical scattering process. This work has been supported by DFG within SFB 634.