Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.11: Poster

Freitag, 4. März 2005, 14:00–18:00, Poster TU C

Competition of Coherence and Decoherence: the Phase Diagram of the Non-Equilibrium Kondo Model — •Stefan Kehrein — Theoretische Physik III - Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg

We study the Kondo effect in quantum dots in a non-equilibrium state due to an applied dc-voltage bias. Using the method of infinitesimal unitary transformations (flow equations), we develop a perturbative scaling picture that naturally contains both equilibrium coherent and non-equilibrium decoherence effects (cond-mat/0410341). The competition of these effects determines the phase diagram of the non-equilibrium Kondo model, and e.g. establishes a large single-channel Kondo physics dominated regime for asymmetrically coupled quantum dots. We present results for the conductance, the local density of states and the spin-spin correlation function at various points in this phase diagram.