https://doi.org/10.1140/epjb/e2004-00082-4
The energy-scale-dependent composite operator method for the single-impurity Anderson model
1
Dipartimento di Fisica “E.R. Caianiello” - Unità di Ricerca INFM di Salerno,
Università degli Studi di Salerno, 84081 Baronissi (SA),
Italy
2
Institut für Festkörper- und Werkstofforschung
(IFW) Dresden, 01171 Dresden, Germany
Corresponding author: a avella@sa.infn.it
Received:
24
September
2003
Published online:
9
April
2004
The recently developed energy-scale-dependent Composite Operator Method is applied to the single-impurity Anderson model. A fully self-consistent solution is given and analyzed. At very low temperatures, the density of states presents, on the top of the high-energy background, a Kondo-like peak whose parameter dependence is discussed in detail. The proposed method reproduces the exact results known in the literature with very low numerical effort and it is applicable for arbitrary values of the external parameters.
PACS: 75.50.Ee – Antiferromagnetics / 75.30.Et – Exchange and superexchange interactions / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.50.-y – Studies of specific magnetic materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
