Nonlocal spin correlations mediated by a superconductor

Abstract

Nonlocal charge correlations induced in two normal metals contacted separately to a supercon- ductor have been studied intensively in the past few years. Here we investigate nonlocal correlations induced by the transfer of pure spin currents through a superconductor on a scale comparable to the superconducting coherence length. As with charge currents, two processes contribute to the nonlocal spin signal: crossed Andreev reflection (CAR), where an electron with spin up injected from one normal metal into the superconductor results in a hole with spin down being injected into the second normal metal, and elastic cotunneling (EC), where the electron with spin up injected from the first normal metal results in an electron with spin up being injected into the second normal metal. Unlike charge currents, however, the spin currents associated with CAR and EC add due to the fact that the bulk superconductor cannot sustain a net spin current.

4 pages, 2 figures

References in corpus (8)

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• Remotely induced magnetism in a normal metal using a superconducting spin-valve
• Local and non-local thermopowers in three-terminal nanostructures
• Theory of Andreev Bound States in S-F-S Junctions and S-F Proximity Devices
• Novel non-local effects in three-terminal hybrid devices with quantum dot
• Electron-electron interaction effects on transport through mesoscopic superconducting hybrid junctions