Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 46: Quantum Dots and Wires: Transport

HL 46.3: Vortrag

Mittwoch, 24. März 2010, 14:30–14:45, H17

Adiabatic pumping through an interacting quantum dot with spin-orbit coupling — •Stephan Rojek and Jürgen König — Theoretische Physik, Universität Duisburg-Essen and CeNIDE, 47048 Duisburg, Germany

We study adiabatic pumping through a two-level quantum dot coupled to two normal leads in the presence of spin-orbit coupling. Varying the two energy levels of the dot periodically in time can generate finite charge and spin currents. To calculate the pumped charge and spin we use a generalization of Brouwer’s formula for interacting systems relates the pumped charge to the instantaneous Green’s functions of the dot [1]. We calculate the latter by means of an equation-of-motion technique. In order to investigate the influence of Coulomb interaction we study the limits of noninteracting and strongly interacting electrons on the quantum dot. We find that the sign of the pumped charge and spin can change with regard to the spin-orbit coupling strength and we discuss differences between the charge and spin transport characteristics.
[1] J. Splettstoesser et al., Phys. Rev. Lett. 95, 246803 (2005).