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Quasiparticle dispersion of the t-J and Hubbard models
A. Moreo, S. Haas, A. Sandvik +1
The spectral weight of the two dimensional and Hubbard models has been calculated using exact diagonalization and quantum Monte Carlo techniques, a…
Shadow Bands in the Cuprates
Stephan Haas, Adriana Moreo, Elbio Dagotto
A consequence of strong antiferromagnetic correlations in models of high-Tc cuprates is the appearance in photoemission (PES) calculations of considerable more weight above the Fer…
On the Liaison Between Superconductivity and Phase Separation
Stephan Haas, Elbio Dagotto, Alexander Nazarenko +1
Models of strongly correlated electrons that tend to phase separate are studied including a long-range 1/r repulsive interaction. It is observed that charge-density-wave states bec…
Antiferromagnetic and van Hove Scenarios for the Cuprates: Taking the Best of Both Worlds
Elbio Dagotto, Alexander Nazarenko, Adriana Moreo
A theory for the high temperature superconductors is proposed. Holes are spin-1/2, charge e, quasiparticles strongly dressed by spin fluctuations. Based on their dispersion, it is…
Is there spin-charge separation in the 2D Hubbard and t-J models at low electronic densities?
Y. C. Chen, A. Moreo, F. Ortolani +2
The spin and density correlation functions of the two-dimensional Hubbard model at low electronic density are calculated in the ground state by using the power method, and at…
Flat quasiparticle dispersion and a hidden small energy scale in the 2D t-J model
Elbio Dagotto, Alexander Nazarenko, Massimo Boninsegni
A model of weakly interacting hole quasiparticles is proposed to describe the normal state of the high temperature superconductors. The effect of strong correlations is contained i…
Optical conductivity of the Hubbard model at finite temperature
Jose A. Riera, Elbio Dagotto
The optical conductivity, , of the two dimensional one-band Hubbard model is calculated at finite temperature using exact diagonalization techniques on finite clusters. The i…