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Abstract: We apply the scattering matrix approach to the triplet proximity effect insuperconductor-half metal structures. We find that for junctions that do notmix different orbital modes, the zero bias Andreev conductance vanishes, whilethe zero bias Josephson current is nonzero. We illustrate this finding on aballistic 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 regiontakes place through a single conducting channel. Our calculations for thesephysically single mode setups - single mode point contacts and chaotic quantumdots with single mode contacts - illustrate the main strength of thescattering matrix approach: it allows for studying systems in the quantummechanical limit, which is inaccessible for quasiclassical Green-s functionmethods, the main theoretical tool in previous works on the triplet proximityeffect.



Autor: B. Béri, J. N. Kupferschmidt, C. W. J. Beenakker, P. W. Brouwer

Fuente: https://arxiv.org/



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