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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).