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Doping dependence of on-site quantities in the two-dimensional Hubbard model

โœ Scribed by F. Mancini; S. Marra; H. Matsumoto

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
256 KB
Volume
244
Category
Article
ISSN
0921-4534

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โœฆ Synopsis

The two-dimensional Hubbard model is studied by means of the composite operator approach. In a generalized mean-field approximation we calculate local quantities, as the double occupancy and the magnetic moment, for various values of the particle density, repulsive Coulomb interaction and temperature. Comparison with the results obtained by other authors by means of numerical analysis shows quite good agreement.

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Properties of doped holes in the antifer
Properties of doped holes in the antiferromagnetic state of the two-dimensional Hubbard model
โœ G. Vignale; M.R. Hedayati ๐Ÿ“‚ Article ๐Ÿ“… 1989 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 128 KB

We calculate the self-energy of a single hole in the half-filled antlferromaguetic two-dimensional Hubbard model. The minimum energy occurs at k = (7r/2, 7r/2) and is 37% lower than in Hartree-Fock. The hole lifetime tends to infinity for low-lying states, showing that quasiholes are well-defined ex