Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-06-16
Phys. Rev. B 80, 045107 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
minor revisions and reference added
Scientific paper
10.1103/PhysRevB.80.045107
The Gutzwiller approximate solution to the Gutzwiller wavefunction yields exact results for the Gutzwiller wavefunction in the infinite dimensional limit. Implicit in the Gutzwiller approximation is an approximate local form of the fermion exchange hole. This approximate form is the same for all dimensions but is incorrect except in infinite dimensions. We implement the correct form for the exchange hole into the Gutzwiller approximation. We perform calculations on the one-dimensional Hubbard model at half-filling. They indicate that the implementation of the exchange hole already brings the Gutzwiller approximation into very close quantitative agreement with the results of the full Gutzwiller wavefunction. Metallicity as well as anti-ferromagnetism are recovered.
der Linden Wolfgang von
Evertz Hans Gerd
Hetenyi Balazs
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