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Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.17: Poster

Friday, March 4, 2005, 14:00–18:00, Poster TU C

Aharonov-Bohm Interferometry with Quantum Dots — •Stefan Legel1, Jürgen König2, Jan Martinek3, and Gerd Schön11Universität Karlsruhe — 2Ruhr-Universität Bochum — 3Institute of Molecular Physics, PAS, Poznan, Poland

The manifestations of quantum coherence are in the foundations of the physics of mesoscopic systems. The presence of quantum coherence is detectable through interference experiments.

We study electron transport through a closed Aharonov-Bohm interferometer containing two single-level quantum dots. We address the question how electron-electron interaction on the dots affects the coherence of the transport. The method of real-time transport theory enables us to treat these systems both in equilibrium as well as in non-equilibrium. A perturbation expansion in the coupling strength of the quantum dots to the leads allows us to make predictions for the signatures of quantum interference in the conductance of the considered systems in first and second order (so-called cotunneling) in the coupling strength.

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