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Superconductor proximity effects in half-metallic ferromagnets

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Because of the complete absence of minority carriers in a half metal, Andreev reflection is not possible at the interface between a half metal and an s-wave superconductor, unless the spin-rotation symmetry around the magnetization axis in the half metal is broken. In that case Andreev reflection can take place through the “triplet proximity effect”, first predicted by Bergeret, Volkov and Efetov. In this talk, I’ll consider the effectiveness of various sources of the spatially nonuniform magnetization and discuss differences between serial and lateral contacts between the half metal and the superconductor. In particular, I show a lateral half-metal—superconductor contact may become a perfect triplet Andreev reflector and that the system supports localized Majorana end states in this limit.

This talk is part of the Theory of Condensed Matter series.

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