Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Transport: Nanoelectronics II - Spintronics and Magnetotransport
TT 39.5: Vortrag
Freitag, 29. Februar 2008, 11:45–12:00, EB 202
Adiabatic pumping through a quantum-dot spin valve — •Janine Splettstoesser1, Michele Governale2, and Jürgen König2 — 1Département de Physique Théorique, Université de Genève, Switzerland — 2Institut für Theoretische Physik III, Ruhr-Universität Bochum, Germany
We investigate the adiabatically pumped current through a quantum-dot spin-valve setup, consisting of a quantum dot coupled to two differently polarized ferromagnetic leads (F-dot-F). We therefore resort to a real-time diagrammatic technique in the adiabatic limit, taking into account the Coulomb interaction on the dot exactly. On one hand we investigate the influence of the lead polarizations and of the on-site Coulomb interaction on the pumped charge. On the other hand we are interested in the influence of the pump mechanism on the average dot polarization during a pumping cycle. In the case where only one lead is ferromagnetic and the other one is a normal metal (F-dot-N), we extend our analysis to spin pumping, where we are in particular interested in the ratio between pumped spin and pumped charge.