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

Artem V. Galaktionov; Mikhail S. Kalenkov; Andrei D. Zaikin

doi:10.1103/PhysRevB.77.094520

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

Artem V. Galaktionov, Mikhail S. Kalenkov, Andrei D. Zaikin

DOI 10.1103/PhysRevB.77.094520 · Physical Review B

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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 nonperturbative 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.