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METALLIC STATES IN THE HUBBARD-MODEL AT HALF-FILLING
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UNSPECIFIED (1995) METALLIC STATES IN THE HUBBARD-MODEL AT HALF-FILLING. JOURNAL OF PHYSICS-CONDENSED MATTER, 7 (17). pp. 3237-3246. ISSN 0953-8984.
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Abstract
Using second-order perturbation theory in U for the self-energy, we solve the self-consistent equations for the local Green function of the infinite-dimensional Hubbard model. We consider the cases of Gaussian and semicircular free densities of states (DOS), and calculate the spectral densities rho(omega) for various U. In the semicircular case we investigate the existence of a Mon transition at half-filling. Even for large U we obtain a metallic solution. Treating the free Dos as a variable parameter, the method also gives an approximate solution of the finite-dimensional Hubbard model. We consider the case of a (regularized) logarithmic Dos appropriate for the two-dimensional case.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | JOURNAL OF PHYSICS-CONDENSED MATTER | ||||
Publisher: | IOP PUBLISHING LTD | ||||
ISSN: | 0953-8984 | ||||
Official Date: | 24 April 1995 | ||||
Dates: |
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Volume: | 7 | ||||
Number: | 17 | ||||
Number of Pages: | 10 | ||||
Page Range: | pp. 3237-3246 | ||||
Publication Status: | Published |
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