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TT: Fachverband Tiefe Temperaturen

TT 21: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3

TT 21.4: Talk

Tuesday, March 27, 2012, 10:15–10:30, BH 334

Zero bias anomalies in electron transport across quantum dots — •Johannes Kern and Milena Grifoni — Universität Regensburg, D-93040 Regensburg, Germany

We describe the electron transport across a quantum dot which is coupled to two contacts at different chemical potentials using a diagrammatic approach. By summing up a subclass of diagrams of all orders in the tunneling Hamiltonian, we are able to describe a low temperature regime where the differential conductance develops a maximum at zero bias. We exemplify our theory for the case of the single impurity Anderson model and compare our results with experimental findings.