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Nonequilibrium Transport through a Spinful Quantum Dot with Superconducting Leads

Publication: Research - peer-reviewJournal article

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We study the nonlinear cotunneling current through a spinful quantum dot contacted by two superconducting leads. Applying a general nonequilibrium Green function formalism to an effective Kondo model, we study the rich variation in the IV characteristics with varying asymmetry in the tunnel coupling to source and drain electrodes. The current is found to be carried, respectively, by multiple Andreev reflections in the symmetric limit, and by spin-induced Yu-Shiba-Rusinov bound states in the strongly asymmetric limit. The interplay between these two mechanisms leads to qualitatively different IV characteristics in the crossover regime of intermediate symmetry, consistent with recent experimental observations of negative differential conductance and repositioned conductance peaks in subgap cotunneling spectroscopy.
Original languageEnglish
JournalPhysical Review Letters
Volume107
Issue number25
Pages (from-to)256802
Number of pages5
ISSN0031-9007
DOIs
StatePublished - 14 Dec 2011

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