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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4774

Title: LOCAL APPROACH TO THE ONE-BAND HUBBARD-MODEL - EXTENSION OF THE COHERENT-POTENTIAL APPROXIMATION
Authors: LAAD, MS
Keywords: infinite dimensions
fermions
lattice
Issue Date: 1994
Publisher: AMERICAN PHYSICAL SOC
Citation: PHYSICAL REVIEW B, 49(4), 2327-2330
Abstract: We present a simple scheme to extend the earlier single-site coherent-potential-approximation (CPA) theories by utilizing connections of the CPA solution with the exact solution of the Falicov-Kimball model in infinite dimensions, and with the single-impurity Anderson-type models. We study the local spectral density of the model at n = I; in the metallic regime, this exhibits a narrow Abrikosov-Suhl resonance and satellite peaks, which correspond, respectively, to the quasiparticle and Hubbard subband structures. This collective resonance disappears in the split-band (insulating) regime, where the CPA is found to be a good approximation. Comparisons are made with numerical works on finite-sized two-dimensional lattices, and good agreement is obtained.
URI: http://dx.doi.org/10.1103/PhysRevB.49.2327
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4774
http://hdl.handle.net/10054/4774
ISSN: 0163-1829
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