ANALYSIS OF THE TWO-DIMENSIONAL NEGATIVE-U HUBBARD MODEL BY COMPOSITE OPERATOR METHOD
1996 ◽
Vol 10
(22)
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pp. 2745-2756
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Keyword(s):
The two-dimensional negative-U Hubbard model is studied by means of the composite operator approach. In a generalized mean-field approximation we calculate different quantities, as the chemical potential, the double occupancy, the static uniform spin magnetic susceptibility and the density of states for various values of the particle density, attractive on-site interaction and temperature. Comparison with the results obtained by numerical analysis on finite size lattices shows a good agreement.
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2010 ◽
Vol 2010
◽
pp. 1-5
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2019 ◽
Vol 1354
◽
pp. 012017
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2019 ◽
Vol 34
(31)
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pp. 1950199
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1988 ◽
Vol 01
(09n10)
◽
pp. 341-347
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