Andreev Conductance through a Quantum Dot Strongly Coupled to Ferromagnetic and Superconducting Leads

K.P. Wójcik and I. Weymann Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

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We analyze the Andreev conductance through a quantum dot strongly coupled to one ferromagnetic and one superconducting lead. The transmission due to the Andreev reflection is obtained from the numerical renormalization group method. We show that at low temperatures, depending on the dot level position, the Andreev conductance exhibits a peak at zero bias due to the Kondo effect, which can be split by the exchange field due to spin-dependent coupling to ferromagnetic lead.

DOI: 10.12693/APhysPolA.132.143 PACS numbers: 73.23.-b, 72.15.Qm, 74.45.+c, 72.25.-b