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13 papers · 1 filter
Effects of Next-Nearest-Neighbor Hopping on the Hole Motion in an Antiferromagnetic Background
Avraham Schiller, Pradeep Kumar, Rainer Strack +1
In this paper we study the effect of next-nearest-neighbor hopping on the dynamics of a single hole in an antiferromagnetic (Néel) background. In the framework of large dimensions…
A Model for Solid He: II
J. Dubois, P. Kumar
We propose a simple Ginzburg-Landau free energy to describe the magnetic phase transition in solid He. The free energy is analyzed with due consideration of the hard first orde…
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…