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TT: Fachverband Tiefe Temperaturen
TT 9: Superconductivity - Heterostructures, Andreev Scattering, Proximity Effect, Coexistence
TT 9.4: Hauptvortrag
Montag, 26. März 2007, 17:00–17:30, H20
Crossed Andreev Reflection in Superconductor-Ferromagnet Hybrid Structures — •Detlef Beckmann1, Jakob Brauer1, Dagmar Rall1, and Hilbert v. Löhneysen2,3 — 1Forschungszentrum Karlsruhe, Institut für Nanotechnologie — 2Forschungszentrum Karlsruhe, Institut für Festkörperphysik — 3Physikalisches Institut, Universität Karlsruhe
We report on conductance measurements on multiterminal superconductor nanostructures,
where two ferromagnetic or normal-metal leads form tunnel contacts
to a single superconductor. The focus is on transport at energies below the
superconducting gap, and length scales below the
coherence length. We observe a negative non-local resistance which
can be interpreted in terms of crossed Andreev reflection,
a process where an electron incident from one of the leads gets reflected
as a hole into the other, thereby creating a pair of spatially separated,
entangled particles.
D. Beckmann, H.B. Weber and H.v. Löhneysen, Phys. Rev. Lett. 93, 197003 (2004)
D. Beckmann and H.v. Löhneysen, cond-mat/0609766