Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.2: Poster

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

Transport through an interacting quantum dot tunnel coupled to a ferromagnet with time-dependent magnetisation — •Nina Winkler, Michele Governale, and Jürgen König — Institut für Theoretische Physik III · Ruhr-Universität Bochum

We study spin and charge transport through a system composed of a quantum dot with Coulomb interaction, weakly tunnel coupled to a normal and a ferromagnetic lead with time-dependent magnetisation. We also allow the level position of the dot and the tunnel coupling to the normal lead to vary in time. In general, this setup works as a quantum pump and we focus on the adiabatic-pumping regime. To calculate the pumped charge and spin we extend a diagrammatic real-time approach to pumping through interacting quantum dots [ 1] to include ferromagnetic leads with time-dependent magnetisations.

[ 1] J. Splettstoesser, M. Governale, J. König, and R. Fazio, Phys. Rev. B 74, 085305 (2006).