Unified Description of Fermi and Non-Fermi Liquid Behavior in a Conserving Slave Boson Approximation for Strongly Correlated Impurity Models

J. Kroha, P. Wölfle, and T. A. Costi
Phys. Rev. Lett. 79, 261 – Published 14 July 1997
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Abstract

We show that the presence of Fermi or non-Fermi liquid behavior in the SU(N)×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 multichannel case in the Kondo limit the bound state contributions are unimportant.

  • Received 7 November 1996

DOI:https://doi.org/10.1103/PhysRevLett.79.261

©1997 American Physical Society

Authors & Affiliations

J. Kroha, P. Wölfle, and T. A. Costi

  • Universität Karlsruhe, Institut für Theorie der Kondensierten Materie, Postfach 6980, 76128 Karlsruhe, Germany

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Vol. 79, Iss. 2 — 14 July 1997

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