Kondo insulators in the periodic Anderson model: a local moment approach

Details Kondo insulators in the periodic Anderson model: a local moment approach Kondo insulators in the periodic Anderson model: a local moment approach

2003-03-12

arxiv.org/abs/cond-mat/0303229v2

Eur. Phys. J. B 32 49-63 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 10 postscript figures, accepted for publication in EPJ B; HyperTex disabled

Scientific paper

10.1140/epjb/e2003-00073-y

The symmetric periodic Anderson model is well known to capture the essential physics of Kondo insulator materials. Within the framework of dynamical mean-field theory, we develop a local moment approach to its single-particle dynamics in the paramagnetic phase. The approach is intrinsically non-perturbative, encompasses all energy scales and interaction strengths, and satisfies the low-energy dictates of Fermi liquid theory. It captures in particular the strong coupling behaviour and exponentially small quasiparticle scales characteristic of the Kondo lattice regime, as well as simple perturbative behaviour in weak coupling. Particular emphasis is naturally given to strong coupling dynamics, where the resultant clean separation of energy scales enables the scaling behaviour of single-particle spectra to be obtained.

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