Kaxiras, EfthimiosMenousakis, Efstratios2009-05-131988Kaxiras, Efthimios and Efstratios Menousakis. Ground state of the strong-coupling Hubbard Hamiltonian: A numerical diagonalization study. Physical Review B 37(1): 656-659.1098-0121http://nrs.harvard.edu/urn-3:HUL.InstRepos:2943923We exactly diagonalize the effective Hamiltonian obtained from the Hubbard model in the strong-coupling limit for a two-dimensional sqrt[10]×sqrt[10] size square lattice. The effective Hamiltonian operates on a restricted Hilbert space containing only states with singly occupied sites, which makes the diagonalization possible within reasonable computational time for the above lattice. The ground-state energy and wave function are obtained for several values of the coupling ratio t / U and the doping fraction x. We find three different phases in the (x,t / U) phase diagram. The first is characterized by antiferromagnetic order which extends to the longest possible distance in the 10-site system. The second and third phases are characterized by antiferromagnetic and ferromagnetic short-range correlations, respectively. We comment on the possible relevance of the results to the recently discovered high-temperature copper-oxide superconductors.en-US10.1103/PhysRevB.37.656