Unified description of Fermi and non-Fermi liquid behavior in a conserving slave boson approximation for strongly correlated impurity models

Details Unified description of Fermi and non-Fermi liquid behavior in a conserving slave boson approximation for strongly correlated impurity models Unified description of Fermi and non-Fermi liquid behavior in a conserving slave boson approximation for strongly correlated impurity models

1996-11-12

arxiv.org/abs/cond-mat/9611096v2

Phys. Rev. Lett. 79, 261 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, Latex, 3 postscript figures included Final version with minor changes in wording, to appear in Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.79.261

We show that the presence of Fermi or non-Fermi liquid behavior in the SU(N) x SU(M) Anderson impurity models may be read off the infrared threshold exponents governing the spinon and holon dynamics in a slave boson representation of these models. We construct a conserving T-matrix approximation which recovers the exact exponents with good numerical accuracy. Our approximation includes both coherent spin flip scattering and charge fluctuation processes. For the single-channel case the tendency to form bound states drastically modifies the low energy behavior. For the multi-channel case in the Kondo limit the bound state contributions are unimportant.

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