Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-07-06
Adv. Solid State Phys. 39, 271 (1999)
Physics
Condensed Matter
Strongly Correlated Electrons
Invited talk, March meeting of the German Physical Society, 1999, 10 pages, 5 figures, style file included
Scientific paper
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)$\times$ 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.
Kroha Johann
Wölfle Peter
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