Kondo effect in Normal-Superconductor Quantum Dots

Details Kondo effect in Normal-Superconductor Quantum Dots Kondo effect in Normal-Superconductor Quantum Dots

2000-09-07

arxiv.org/abs/cond-mat/0009112v1

Phys. Rev. B 63, 094515 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 14 pages, 4 figures

Scientific paper

10.1103/PhysRevB.63.094515

We study the transport properties of a quantum dot coupled to a normal and a superconducting lead. The dot is represented by a generalized Anderson model. Correlation effects are taken into account by an appropriate self-energy which interpolates between the limits of weak and strong coupling to the leads. The transport properties of the system are controlled by the interplay between the Kondo effect and Andreev reflection processes. We show that, depending on the parameters range the conductance can either be enhanced or suppressed as compared to the normal case. In particular, by adequately tunning the coupling to the leads one can reach the maximum value $4e^2/h$ for the conductance.

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