Eur. Phys. J. B 37, 465-471 (2004)
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

Abstract

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.