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TT: Tiefe Temperaturen

TT 5: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts - Part 1

TT 5.4: Talk

Monday, March 27, 2006, 10:30–10:45, HSZ 304

Aharonov-Bohm Interferometry with Quantum Dots — •Stefan Legel¹, Jürgen König², and Gerd Schön^1,3 — ¹Universität Karlsruhe — ²Ruhr-Universität Bochum — ³Forschungszentrum Karlsruhe, Institut für Nanotechnologie

We study electron transport through a closed Aharonov-Bohm interferometer containing two single-level quantum dots. We address the question how Coulomb 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.