COMPREHENSIVE MEAN FIELD THEORY FOR THE HUBBARD MODEL
1992 ◽
Vol 06
(05n06)
◽
pp. 731-747
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Keyword(s):
We derive an exact expression for the grand potential of the Hubbard model in d=∞ dimensions. By simplifying the energy transfer between up and down spins we obtain a comprehensive mean-field theory for this model. It is (i) thermodynamically consistent in the entire range of input parameters, (ii) conserving and, (iii) exact in several non-trivial limits, e. g. in the free (U→0), atomic (t→0) and Heisenberg (U≫t, n=1) limit.
2010 ◽
Vol 200
(1)
◽
pp. 012158
◽
Keyword(s):
2018 ◽
Vol 51
(14)
◽
pp. 145302
◽
2005 ◽
Vol 17
(48)
◽
pp. 7573-7598
◽
Keyword(s):
1995 ◽
Vol 206-207
◽
pp. 712-715
◽
Keyword(s):
Keyword(s):