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TT: Fachverband Tiefe Temperaturen

TT 31: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 2

TT 31.2: Vortrag

Donnerstag, 28. Februar 2008, 12:00–12:15, EB 202

Correlation effects in charge and spin transport properties of quantum impurity models — •Thomas Schmidt¹, Andrei Komnik¹, and Alexander Gogolin² — ¹Physikalisches Institut, Universität Freiburg — ²Imperial College, London, UK

We have investigated the spin and charge transport properties of the Anderson impurity model (AIM) under non-equilibrium conditions. While in the non-interacting case the spin-resolved full counting statistics (FCS) is described by a purely binomial distribution, a small Coulomb interaction U induces correlated electron-pair transport which changes the FCS profoundly. In order to address the complementary large-U domain, we analysed the strong-coupling Kondo fixed point and derived an exact result for a special choice of parameters. The results agree for all regimes. Finally, we propose an experimental setup based on a Hanbury Brown and Twiss interferometer in which these effects can be observed.