Kondo-resonance, Coulomb blockade, and Andreev transport through a quantum dot

Details Kondo-resonance, Coulomb blockade, and Andreev transport through a quantum dot Kondo-resonance, Coulomb blockade, and Andreev transport through a quantum dot

1998-07-27

arxiv.org/abs/cond-mat/9807351v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages Revtex, 4 Postscript figures, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.58.9641

We study resonant tunneling through an interacting quantum dot coupled to normal metallic and superconducting leads. We show that large Coulomb interaction gives rise to novel effects in Andreev transport. Adopting an exact relation for the Green's function, we find that at zero temperature, the linear response conductance is enhanced due to Kondo-Andreev resonance in the Kondo limit, while it is suppressed in the empty site limit. In the Coulomb blockaded region, on the other hand, the conductance is reduced more than the corresponding conductance with normal leads because large charging energy suppresses Andreev reflection.

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