Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures

Details Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures

2007-11-30

arxiv.org/abs/0711.4955v2

Phys. Rev. B 77, 094520 (2008)

Physics

Condensed Matter

Superconductivity

12 pages, 7 figures; version published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.77.094520

We develop a detailed microscopic theory describing dc Josephson effect and Andreev bound states in superconducting junctions with a half-metal. In such systems the supercurrent is caused by triplet pairing states emerging due to spin-flip scattering at the interfaces between superconducting electrodes and the half-metal. For sufficiently clean metals we provide a detailed non-perturbative description of the Josephson current at arbitrary transmissions and spin-flip scattering parameters for both interfaces. Our analysis demonstrates that the behavior of both the Josephson current and Andreev bound states crucially depends on the strength of spin-flip scattering showing a rich variety of features which can be tested in future experiments.

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