Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.1: Poster

Mittwoch, 16. März 2011, 14:00–18:00, P3

Charge transfer statistics of double quantum dots in the Kondo regime — •David Breyel and Andreas Komnik — Institut für Theoretische Physik, Universität Heidelberg

We calculate the full counting statistics (FCS) for a system consisting of two quantum dots in the Kondo regime which are subject to different magnetic fields and are coupled to two metallic leads biased by a finite voltage. With certain restrictions on the coupling constants a transformation consisting of bosonization, rotation and refermionisation maps the Hamiltonian of the system to one of a noninteracting system as in [1,2]. We use the Schwinger-Keldysh-formalism for the Green’s functions in order to derive the FCS along the lines of [3]. We concentrate on the Fano factor which can be calculated from the FCS as well as the effective transmission coefficients. We explain different features of the Fano factor depending on different system parameters. Furthermore, we succeed in linking the features of the effective transmission coefficients to individual transport processes. For instance we conclude that every transport process through the system is accompanied by a spin flip the the positions of the peaks in the transmission coefficient match the strength of the applied magnetic field. Finally, we discuss the experimental implications of the identified FCS features.
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