Physics – Condensed Matter – Superconductivity
Scientific paper
2008-01-11
Phys. Rev. B 77, 104525 (2008)
Physics
Condensed Matter
Superconductivity
6 pages, 6 figures, replaced with published version
Scientific paper
10.1103/PhysRevB.77.104525
We study the out-of-equilibrium current through an interacting quantum dot modelled as an Anderson impurity contacted by two BCS superconductors held at fixed voltage bias. In order to account for multiple Andreev reflections, we develop a Keldysh Green's function scheme perturbative in the dot's interaction strength. We find an unexpected enhancement of the current due to repulsive interactions for small lead-to-dot couplings.
Dell'Anna Luca
Egger Reinhold
Zazunov Alex
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