Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Quantum Chaos
DY 19.14: Talk
Wednesday, March 24, 2010, 17:45–18:00, H38
Fano resonances under the influence of absorption or decoherence — •Stefan Gehler1, Ulrich Kuhl1, Hans-Jürgen Stöckmann1, Andreas Bärnthaler2, Stefan Rotter2, Florian Libisch2, and Joachim Burgdörfer2 — 1Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany — 2Institute for Theoretical Physics, TU Vienna, A-1040 Vienna, Austria
We present theoretical and experimental results on the modification of Fano resonances [1] due to the effect of decoherence [2]. Specifically, our theoretical calculations demonstrate how the asymmetry parameter of Fano resonances in the transmission of microwaves through a metal cavity is affected by the dissipation in the cavity walls. In these dissipative systems the way in which the Fano asymmetry parameter deviates from its fully coherent value is characteristically different from dephasing systems where flux is conserved. These characteristic differences are explored and confirmed in microwave experiments on rectangular metal cavities with varying dissipation strengths.
[1]U. Fano, Phys. Rev. 124 (1961) 1866
[2]S. Rotter, U.Kuhl, F. Libisch, J. Burgdörfer, H.-J. Stöckmann, Physica E 29 (2005) 325-333