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TT: Fachverband Tiefe Temperaturen

TT 20: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 1

TT 20.4: Vortrag

Dienstag, 26. Februar 2008, 15:00–15:15, EB 202

Non-local Andreev reflection in quantum dots — •David Futterer, Michele Governale, and Jürgen König — Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany

We consider a single-level quantum dot attached to one superconducting and two ferromagnetic leads. The transport through this system is influenced by the interplay of proximity effect, spin accumulation, Coulomb interaction and non-equilibrium due to finite bias voltage.

We employ a real-time diagrammatic technique that accounts for coupling both to ferromagnetic[1] and superconducting[2] leads. We perform a systematic expansion in the tunnel-couplings to the leads. In the limit of large superconducting gap, all orders in the tunnel-coupling strength with the superconductor can be resummed. We calculate the transport properties of the system and identify schemes for detection of non-local Andreev reflection.

[1] M. Braun, J. König, and J. Martinek, Phys. Rev. B 70, 195345 (2004)

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