10 papers
Revisiting two holes in a locally antiferromagnetic background: the role of retardation and Coulomb repulsion effects
Jose Riera, Elbio Dagotto
The problem of two holes in the presence of strong antiferromagnetic fluctuations is revisited using computational techniques. Two-dimensional clusters and 2-leg ladders with up to…
Enhancement of Antiferromagnetic Correlations Induced by Nonmagnetic Impurities: Origin and Predictions for NMR Experiments
Markus Laukamp, George Balster Martins, Claudio J. Gazza +5
Spin models that have been proposed to describe dimerized chains, ladders, two dimensional antiferromagnets, and other compounds are here studied when some spins are replaced by sp…
Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities
George Balster Martins, Markus Laukamp, Jose Riera +1
The local enhancement of antiferromagnetic correlations near vacancies observed in a variety of spin systems is analyzed in a single framework. Variational calculations suggest tha…
Hole Doping Evolution of the Quasiparticle Band in Models of Strongly Correlated Electrons for the High-T_c Cuprates
Daniel Duffy, Alexander Nazarenko, Stephan Haas +3
Quantum Monte Carlo (QMC) and Maximum Entropy (ME) techniques are used to study the spectral function of the one band Hubbard model in strong coupling including a ne…
Spin dynamics of the spin-Peierls compound CuGeO_3 under magnetic field
D. Poilblanc, J. Riera, C. A. Hayward +2
The magnetic field--driven transition in the spin-Peierls system CuGeO_3 associated with the closing of the spin gap is investigated numerically. The field dependence of the spin d…
Ferromagnetism in Electronic Models for Manganites
Jose Riera, Karen Hallberg, Elbio Dagotto
Ground state properties of the Kondo model for manganese oxides in one dimension are studied using numerical techniques. The large Hund coupling () limit is specially analyz…