Author： Smith J. L. Si Q.
Publisher： Edp Sciences
E-ISSN： 1286-4854|45|2|228-234
ISSN： 0295-5075
Source： EPL (EUROPHYSICS LETTERS), Vol.45, Iss.2, 2010-03, pp. : 228-234
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Abstract
We study the non-Fermi liquid behavior in a two-band extendedHubbard model. In the limit of infinite dimensions, whereonly local correlations are taken into account,this model in the mixed-valence regime is known to displaya metallic non-Fermi liquid phase with spin-charge separation.Here we address the effect of intersite RKKY-like interactionsusing an extended dynamical mean-field approach.We find that the spin-charge separation survivesthe quantum fluctuations associated with the intersite density-density and spin-exchange interactions.We determine the spin, charge, and single-particle correlationfunctions in the non-Fermi liquid state.
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