Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Transport: Nanoelectronics I - Quantum Dots and Wires, Point Contacts 2
TT 11.6: Vortrag
Montag, 23. März 2009, 15:30–15:45, HSZ 301
Dephasing due to phonons in a double dot Aharonov-Bohm interferometer — •Björn Kubala1, David Roosen2, Florian Marquardt1, and Walter Hofstetter2 — 1Physics Department, ASC, and CeNS, Ludwig-Maximilians-Universität, 80333 Munich, Germany — 2Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt/Main, Germany
We investigate an Aharonov-Bohm interferometer consisting of two quantum dots coupled in parallel to two lead electrodes and to a common Einstein phonon mode. Without coupling to phonons transport of noninteracting electrons is fully coherent and the interferometer can be tuned to complete destructive interference even for finite applied bias. If phonons couple differently to the electrons on the two dots, which-path infomation is transferred to the phononic bath and the electronic coherence is diminished. It is only this dephasing due to phonons which enables transport, making the device ideal for studying decoherence issues. In this talk, we focus on results from Keldysh diagrammatic perturbation theory, which are complemented by studies using the numerical renormalization group.