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29 March 2024
 
  » arxiv » cond-mat/0007103

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Fermi and non-Fermi Liquid Behavior in Quantum Impurity Systems: Conserving Auxiliary Particle Theory
J. Kroha ; P. Wölfle ;
Date 6 Jul 2000
Journal Adv. Solid State Phys. 39, 271 (1999)
Subject Strongly Correlated Electrons | cond-mat.str-el
AffiliationInst. TKM, Universität Karlsruhe
AbstractWe review a recently developed method, based on an exact auxiliary boson representation, to describe both Fermi liquid and non-Fermi liquid behavior in quantum impurity systems. Coherent spin and charge fluctuation processes are taken into account in a self-consistent way and are shown to include {it all} leading and subleading infrared singularities at any given order of the self-consistent loop expansion of the free energy. As a consequence, for the SU(N)$ imes$ SU(M) Anderson impurity models the correct temperature dependence of the susceptibility is recovered over the entire temperature range, including Fermi liquid or non-Fermi liquid behavior below the Kondo temperature $T_K$. As a standard diagram technique the presented method has the potential to be generalized to correlated electron systems on a lattice.
Source arXiv, cond-mat/0007103
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