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Article overview
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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 | Affiliation: | Inst. TKM, Universität Karlsruhe | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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