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- W2165004669 abstract "We exactly diagonalize the effective Hamiltonian obtained from the Hubbard model in the strong-coupling limit for a two-dimensional $sqrt{10}ifmmodetimeselsetexttimesfi{}sqrt{10}$ 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 $frac{t}{U}$ and the doping fraction $x$. We find three different phases in the ($x,frac{t}{U}$) 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." @default.
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- W2165004669 date "1988-01-01" @default.
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- W2165004669 title "Ground state of the strong-coupling Hubbard Hamiltonian: A numerical diagonalization study" @default.
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- W2165004669 doi "https://doi.org/10.1103/physrevb.37.656" @default.
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