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LOCAL APPROACH TO THE ONE-BAND HUBBARD-MODEL - EXTENSION OF THE COHERENT-POTENTIAL APPROXIMATION

DSpace at IIT Bombay

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Title LOCAL APPROACH TO THE ONE-BAND HUBBARD-MODEL - EXTENSION OF THE COHERENT-POTENTIAL APPROXIMATION
 
Creator LAAD, MS
 
Subject infinite dimensions
fermions
lattice
 
Description 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.
 
Publisher AMERICAN PHYSICAL SOC
 
Date 2011-07-17T15:50:41Z
2011-12-26T12:50:23Z
2011-12-27T05:51:25Z
2011-07-17T15:50:41Z
2011-12-26T12:50:23Z
2011-12-27T05:51:25Z
1994
 
Type Article
 
Identifier PHYSICAL REVIEW B, 49(4), 2327-2330
0163-1829
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
 
Language en