Crossed Andreev reflection at spin-active interfaces

Details Crossed Andreev reflection at spin-active interfaces Crossed Andreev reflection at spin-active interfaces

2007-06-25

arxiv.org/abs/0706.3575v2

Phys. Rev. B 76, 224506 (2007)

Physics

Condensed Matter

Superconductivity

11 pages, 7 figures; figures 6 and 7 are corrected; version published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.224506

With the aid of the quasiclassical Eilenberger formalism we develop a theory of non-local electron transport across three-terminal ballistic normal-superconducting-normal (NSN) devices with spin-active NS interfaces. The phenomenon of crossed Andreev reflection (CAR) is known to play the key role in such transport. We demonstrate that CAR is highly sensitive to electron spins and yields a rich variety of properties of non-local conductance which we describe non-perturbatively at arbitrary voltages, temperature, spin-dependent interface transmissions and their polarizations. Our results can be applied to multi-terminal hybrid structures with normal, ferromagnetic and half-metallic electrodes and can be directly tested in future experiments.

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