Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: TR: Quantum Coherence and Quantum Information Systems 2 (jointly with MA and HL)
TT 34.4: Vortrag
Mittwoch, 16. März 2011, 14:45–15:00, HSZ 03
Probing decoherence through Fano resonances — •Stefan Rotter1, Andreas Bärnthaler1, Florian Libisch1, Joachim Burgdörfer1, Stefan Gehler2, Ulrich Kuhl2, and Hans-Jürgen Stöckmann2 — 1Institute for Theoretical Physics, TU Vienna, Austria — 2Fachbereich Physik, Philipps-Universität Marburg, Germany
We investigate the effect of decoherence on Fano resonances in wave transmission through resonant scattering structures [1]. We show that the Fano asymmetry parameter q follows, as a function of the strength of decoherence, trajectories in the complex plane that reveal detailed information on the underlying decoherence process. Dissipation and unitary dephasing give rise to manifestly different trajectories. Our predictions are successfully tested against microwave experiments with metal cavities and against previously published data on the temperature dependence of transport through quantum dots [2].
A. Bärnthaler, S. Rotter, F. Libisch et al., Phys. Rev. Lett. 105, 056801 (2010).
I. G. Zacharia, D. Goldhaber-Gordon, G. Granger et al., Phys. Rev. B 64, 155311 (2001).