Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: SC: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 7.12: Vortrag

Montag, 22. März 2010, 17:15–17:30, H20

Pure spin current with interacting quantum dots — •David Futterer¹, Michele Governale², and Jürgen König¹ — ¹Theoretische Physik, Universität Duisburg Essen and CeNIDE, D-47048 Duisburg, Germany — ²School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand

We investigate sub-gap transport through an interacting quantum dot tunnel coupled to a superconducting, a ferromagnetic and a normal conducting lead. Despite the tendency of a large charging energy to suppress the equilibrium proximity effect on the dot, a finite Andreev current can be achieved in non-equilibrium situations. Due to the coupling to a ferromagnet, spin can accumulate on the dot. We find situations in which a pure spin current, that is zero charge current together with a finite spin current, occurs in the normal lead. For our calculation we apply a real-time transport theory [1,2].

[1] M. G. Pala, M. Governale, and J. König, New J. Phys. 9, 278 (2007).

[2] M. Governale, M. G. Pala, and J. König, Phys. Rev. B 77, 134513 (2008).