Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-02-06
Phys. Rev. B 79, 224521 (2009).
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 11 figures. Last version: we added several extra references, modified two figures, and discussed recent proposals fo
Scientific paper
We develop a general perturbative framework based on a superconducting atomic limit for the description of Andreev bound states (ABS) in interacting quantum dots connected to superconducting leads. A local effective Hamiltonian for dressed ABS, including both the atomic (or molecular) levels and the induced proximity effect on the dot is argued to be a natural starting point. A self-consistent expansion in single-particle tunneling events is shown to provide accurate results even in regimes where the superconducting gap is smaller than the atomic energies, as demonstrated by a comparison to recent Numerical Renormalization Group calculations. This simple formulation may have bearings for interpreting Andreev spectroscopic experiments in superconducting devices, such as STM measurements on carbon nanotubes, or radiative emission in optical quantum dots.
Florens Serge
Meng Tobias
Simon Pascal
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