Single-particle dynamics of the Anderson model: a local moment approach

Abstract

A non-perturbative local moment approach to single-particle dynamics of the\ngeneral asymmetric Anderson impurity model is developed. The approach\nencompasses all energy scales and interaction strengths. It captures thereby\nstrong coupling Kondo behaviour, including the resultant universal scaling\nbehaviour of the single-particle spectrum; as well as the mixed valent and\nessentially perturbative empty orbital regimes. The underlying approach is\nphysically transparent and innately simple, and as such is capable of practical\nextension to lattice-based models within the framework of dynamical mean-field\ntheory.\n