Quantum limit of the triplet proximity effect in half-metal - superconductor junctions

Abstract

We apply the scattering matrix approach to the triplet proximity effect in superconductor-half metal structures. We find that for junctions that do not mix different orbital modes, the zero bias Andreev conductance vanishes, while the zero bias Josephson current is nonzero. We illustrate this finding on a ballistic half-metal--superconductor (HS) and superconductor -- half-metal -- superconductor (SHS) junction with translation invariance along the interfaces, and on HS and SHS systems where transport through the half-metallic region takes place through a single conducting channel. Our calculations for these physically single mode setups -- single mode point contacts and chaotic quantum dots with single mode contacts -- illustrate the main strength of the scattering matrix approach: it allows for studying systems in the quantum mechanical limit, which is inaccessible for quasiclassical Green's function methods, the main theoretical tool in previous works on the triplet proximity effect.

12 pages, 10 figures; v2: references added, typos corrected

References in corpus (3)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Symmetries of Pairing Correlations in Superconductor-Ferromagnet Nanostructures
• Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures

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• Collective magnetic and plasma excitations in Josephson $\psi$ junctions
• Theory of spin polarization in mesoscopic spin-orbit coupling systems
• Theoretical study of magnetism induced by proximity effect in a ferromagnetic Josephson junction with a normal metal
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