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

Abstract

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.

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

References in corpus (5)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Quantum supercurrent transistors in carbon nanotubes
• Symmetries of Pairing Correlations in Superconductor-Ferromagnet Nanostructures
• Nonlocal Andreev reflection at high transmissions
• Spin-resolved crossed Andreev reflection in ballistic heterostructures

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