Andreev Transport in Double Quantum Dot Cooper Pair Splitters in the Presence of External Magnetic Field

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

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The effect of external magnetic field on the transport properties of double quantum dots coupled to normal and superconducting leads is studied by means of the real-time diagrammatic technique in the sequential tunneling regime. This device works as a gate-controlled Cooper pair splitter. We focus on the transport regime where the current is blocked due to the spin triplet blockade. It is shown that external magnetic field can modify the Andreev current and differential conductance. In particular, magnetic field can suppress the negative differential conductance associated with the triplet blockade.

DOI: 10.12693/APhysPolA.127.502 PACS numbers: 73.23.-b, 73.21.La, 74.45.+c