Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.42: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

Andreev transport in a correlated ferromagnet-quantum-dot-superconductor device — •Krzysztof P. Wójcik and Ireneusz Weymann — Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

In this contribution the spin-resolved Andreev transport in a hybrid ferromagnet-quantum-dot-superconductor device is discussed. In particular, the Andreev transmission and the resulting linear response conductance, calculated by means of the numerical renormalization group method, are analyzed. We show that, generally, the transport properties are conditioned by the interplay of correlations leading to the Kondo effect, superconducting proximity effect and the ferromagnetic-contact-induced exchange field. The exchange field greatly affects the low-energy behavior of the Andreev transmission by splitting the Kondo resonance. Moreover, it leads to a nonmonotonic dependence of the Andreev conductance on the dot level position. At low temperatures, the conductance has a peak at the particle-hole symmetry point, which however becomes quickly suppressed with increasing the temperature.