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Unified description of Fermi and non-Fermi liquid behavior in a conserving slave boson approximation for strongly correlated impurity models | | J. Kroha
; P. Wölfle
; T.A. Costi
; | | Date: |
12 Nov 1996 | | Journal: | Phys. Rev. Lett. 79, 261 (1997) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | Univ. Karlsruhe | | Abstract: | We show that the presence of Fermi or non-Fermi liquid behavior in the SU(N) x 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 multi-channel case in the Kondo limit the bound state contributions are unimportant. | | Source: | arXiv, cond-mat/9611096 | | Services: | Forum | Review | PDF | Favorites | |
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