Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.9: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

Excited states in the conductance of a double dot — Georg Begemann, •Andrea Donarini, and Milena Grifoni — University of Regensburg, Germany

We study the linear transport through two coupled interacting quantum dots in series at temperatures smaller than the tunneling rate, though still larger than the Kondo temperature.

In this regime the sequential tunnelling picture breaks down and the conductance is not uniquely determined by ground states transitions. Coulomb blockade is partially lifted due to transitions to excited states and also the resonances acquire a dependance on the tunnelling coupling to the leads.

We adopt in our calculation the equation of motion technique and systematically compare different truncation schemes unified under a general formalism.