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

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          Abstract

          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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          Author and article information

          Journal
          12 March 2003
          2003-03-13
          Article
          10.1140/epjb/e2003-00073-y
          cond-mat/0303229
          d41f5095-6c7e-48ac-a6fd-180aaee9e7b8
          History
          Custom metadata
          Eur. Phys. J. B 32 49-63 (2003)
          15 pages, 10 postscript figures, accepted for publication in EPJ B; HyperTex disabled
          cond-mat.str-el

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