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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…
One particle spectral weight of the three dimensional single band Hubbard model
M. Ulmke, R. T. Scalettar, A. Nazarenko +1
Dynamic properties of the three-dimensional single-band Hubbard model are studied using Quantum Monte Carlo combined with the maximum entropy technique. At half-filling, there is a…
Photoemission Spectra in t-J Ladders with Two Legs
Stephan Haas, Elbio Dagotto
Photoemission spectra for the isotropic two-leg t-J ladder are calculated at various hole-doping levels using exact diagonalization techniques. Low-energy sharp features caused by…
Hole Dispersion and Symmetry of the Superconducting Order Parameter for Underdoped CuO Bilayers and 3D Antiferromagnets
Alexander Nazarenko, Elbio Dagotto
We calculate the dispersion of a hole in bilayers and 3D antiferromagnets, using the self-consistent Born approximation (SCBA) to the model. Superconductivity a…
Electronic Hamiltonian for Transition Metal Oxide Compounds
Erwin Müller-Hartmann, Elbio Dagotto
An effective electronic Hamiltonian for transition metal oxide compounds is presented. For Mn-oxides, the Hamiltonian contains spin-2 ``spins'' and spin-3/2 ``holes'' as degrees of…
Rapid Suppression of the Spin Gap in Zn-doped CuGeO_3 and SrCu_2O_3
George Martins, Elbio Dagotto, José Riera
The influence of non-magnetic impurities on the spectrum and dynamical spin structure factor of a model for CuGeO is studied. A simple extension to Zn-doped …
Spontaneous Coherence and Collective Modes in Double-Layer Quantum Dot Systems
Jun Hu, E. Dagotto, A. H. MacDonald
We study the ground state and the collective excitations of parabolically-confined double-layer quantum dot systems in a strong magnetic field. We identify parameter regimes where…
Influence of Hole Doping on Antiferromagnetic Real-Space Approaches for the High-Tc Cuprates
Alexander Nazarenko, Stephan Haas, Jose Riera +2
Recently proposed scenarios for the cuprates make extensive use of a ``flat'' quasiparticle (q.p.) dispersion and short-range hole-hole interactions in real-space, both caused by a…