Binding of holes in one-band models of oxide superconductors
J. A. Riera, A. P. Young
DOI 10.1103/PhysRevB.39.9697 · Physical Review B
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Abstract
We have performed exact-diagonalization studies of the ground state of the one-band Hubbard model and the related strong-coupling Hamiltonian near half-filling. A tendency towards superconductivity, indicated by a negative ‘‘binding energy,’’ is found to be greater for the strong-coupling Hamiltonian. We find that two holes are attracted to each other for parameter values where the binding energy is negative. The symmetry of the two-hole bound state of the strong-coupling Hamiltonian is predominantly &, in agreement with other calculations.
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