Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: Postersession Transport: Nanoelectronics, Quantum Coherence and Quantum Information, Fluctuations and Noise
TT 35.2: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Non-local Andreev transport through an interacting quantum dot — •David Futterer1, Michele Governale1, Marco G. Pala2, and Jürgen König1 — 1Theoretische Physik, Universität Duisburg-Essen, D-47048 Duisburg, Germany — 2IMEP-LAHC-MINATEC (UMR CNRS/INPG/UJF 5130), 38016 Grenoble, France
We investigate sub-gap transport through an interacting quantum dot tunnel coupled to one superconducting lead and two normal conducting leads which can be either ferromagnetic or non-magnetic[1]. 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. We propose two schemes to identify non-local Andreev transport. In one of them, we identify crossed Andreev reflection by the dependence of the Andreev current on the relative orientation and polarization of the ferromagnetic leads. In the second scheme, the presence of strong Coulomb interaction leads to negative values of the non-local conductance as a clear signal of non-local Andreev transport. For our calculation we apply a real-time transport theory[2,3] in the limit of a large pair potential Δ.
[1] D. Futterer, M. Governale, M. G. Pala, and J. König, arXiv:0806.0237(2008).
[2] M. G. Pala, M. Governale, and J. König, New J. Phys. 9, 278 (2007).
[3] M. Governale, M. G. Pala, and J. König, Phys. Rev. B 77, 134513 (2008).