Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-03-08
J. Phys.: Condens. Matter 20 (2008) 275213
Physics
Condensed Matter
Strongly Correlated Electrons
18 pages, 7 figures, accepted for publication in Journal of Physics: Condensed Matter
Scientific paper
We use the numerical renormalization group method (NRG) to investigate a single-impurity Anderson model with a coupling of the impurity to a superconducting host. Analysis of the energy flow shows, in contrast to previous belief, that NRG iterations can be performed up to a large number of sites, corresponding to energy differences far below the superconducting gap. This allows us to calculate the impurity spectral function very accurately for frequencies near the gap edge, and to resolve, in a certain parameter regime, sharp peaks in the spectral function close to the gap edge.
Bulla Ralf
Delft Jan von
Hecht Theresa
Weichselbaum Andreas
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