Kondo effect and spin-active scattering in ferromagnet-superconductor junctions

This is the authors' abstract. We don't add key points for this paper.

We study the interplay of superconducting and ferromagnetic correlations on charge transport in different geometries with a focus on both a quantum point contact as well as a quantum dot in the even and the odd state with and without spin-active scattering at the interface. In order to obtain a complete picture of the charge transport we calculate the full counting statistics in all cases and compare the results with experimental data. We show that spin-active scattering is an essential ingredient in the description of quantum point contacts. This holds also for quantum dots in an even charge state, whereas it is strongly suppressed in a typical Kondo situation. We explain this feature by the strong asymmetry of the hybridizations with the quantum dot and show how Kondo peak splitting in a magnetic field can be used for spin filtering. For the quantum dot in the even state, spin-active scattering allows for an explanation of the experimentally observed mini-gap feature.