Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-11-20
Physics
Condensed Matter
Strongly Correlated Electrons
17 pages. Corrected figures
Scientific paper
10.1103/PhysRevB.59.14005
The interactions between holes in the Hubbard model, in the low density, intermediate to strong coupling limit, are investigated by systematically improving mean field calculations. The Configuration Interaction basis set is constructed by applying to local Unrestricted Hartree-Fock configurations all lattice translations and rotations. It is shown that this technique reproduces, correctly, the properties of the Heisenberg model, in the limit of large U. Upon doping, dressed spin polarons in neighboring sites have an increased kinetic energy and an enhanced hopping rate. Both effects are of the order of the hopping integral and lead to an effective attraction at intermediate couplings.
Guinea Francisco
Lopez-Sancho Pilar M.
Louis Enrique
Verges Jose A.
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