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Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 61: TR: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3

TT 61.3: Talk

Friday, March 18, 2011, 11:00–11:15, HSZ 304

Decoherence in a Double-Dot Aharonov-Bohm Interferometer — •Björn Kubala1, David Roosen2, Michael Sindel3, Walter Hofstetter2, and Florian Marquardt11Institute for Theoretical Physics, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen, Germany — 2Institut für Theoretische Physik, Goethe Universität, 60438 Frankfurt/Main, Germany — 3Physics Department, ASC and CeNs, Ludwig-Maximilians-Universität, 80333 Munich, Germany

Coherence in electronic interferometers is typically believed to be restored fully in the limit of small voltages, frequencies and temperatures. However, it is crucial to check this essentially perturbative argument by nonperturbative methods. Here, we use the numerical renormalization group to study ac transport and decoherence in an experimentally realizable model interferometer, a parallel double quantum dot coupled to a phonon mode. The model allows to clearly distinguish renormalization effects from decoherence. We discuss finite frequency transport and confirm the restoration of coherence in the dc limit.

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