Observation of Andreev bound states at spin-active interfaces

Details Observation of Andreev bound states at spin-active interfaces Observation of Andreev bound states at spin-active interfaces

2010-12-17

arxiv.org/abs/1012.3867v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, revtex

Scientific paper

We report on high-resolution differential conductance experiments on nanoscale superconductor/ferromagnet tunnel junctions with ultra-thin oxide tunnel barriers. We observe subgap conductance features which are symmetric with respect to bias, and shift according to the Zeeman energy with an applied magnetic field. These features can be explained by resonant transport via Andreev bound states induced by spin-active scattering at the interface. From the energy and Zeeman shift of the bound states, both the magnitude and sign of the spin-dependent interfacial phase shifts between spin-up and spin-down electrons can be determined. These results provide microscopic insight into the triplet proximity effect at spin-active interfaces.

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