– Niels Bohr Institute - University of Copenhagen

Forward this page to a friend Resize Print Bookmark and Share

Niels Bohr Institute > Staff

Nonequilibrium Transport through a Spinful Quantum Dot with Superconducting Leads

Publication: Research - peer-reviewJournal article


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
Issue number25
Pages (from-to)256802
Number of pages5
StatePublished - 14 Dec 2011

Number of downloads are based on statistics from Google Scholar and www.ku.dk

No data available

ID: 36141443