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Correlated Electrons in High Temperature Superconductors
Elbio Dagotto
Theoretical ideas and experimental results concerning high temperature superconductors are reviewed. Special emphasis is given to calculations carried out with the help of computer…
Superconductivity in the Cuo Hubbard Model with Long-Range Coulomb Repulsion
Jose Riera, Elbio Dagotto
A multiband CuO Hubbard model is studied which incorporates long-range (LR) repulsive Coulomb interactions. In the atomic limit, it is shown that a charge-transfer from copper to o…
Superconductivity Near Phase Separation in Models of Correlated Electrons
E. Dagotto, J. Riera, Y. C. Chen +4
Numerical and analytical studies of several models of correlated electrons are discussed. Based on exact diagonalization and variational Monte Carlo techniques, we have found stron…
Cluster diagonalization in systematically expanded Hilbert spaces: application to models of correlated electrons
Jose' Riera, Elbio Dagotto
A method of cluster diagonalization in a systematically expanded Hilbert space is described. We discuss some applications of this procedure to models of high-T_c superconductors, l…
Random Exchange Disorder in the Spin-1/2 XXZ Chain
Stephan Haas, Jose Riera, Elbio Dagotto
The one-dimensional XXZ model is studied in the presence of disorder in the Heisenberg Exchange Integral. Recent predictions obtained from renormalization group calculations are in…
Bound states of holes in an antiferromagnet
D. Poilblanc, J. Riera, E. Dagotto
The formation of bound states of holes in an antiferromagnetic spin-1/2 background is studied using numerical techniques applied to the Hamiltonian on clusters with up…