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4 papers · 2 filters
Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na_0.3CoO_2
H. Ishida, M. D. Johannes, A. Liebsch
The t2g quasi-particle spectra of Na_0.3CoO_2 are calculated within the dynamical mean field theory. It is shown that as a result of dynamical Coulomb correlations charge is transf…
Double-Exchange Model on Triangle Chain
Atsuo Satou, Masanori Yamanaka
We study ground state properties of the double-exchange model on triangle chain in the classical limit on spins. The ground state is determined by a competition among the…
Extended Hubbard Model with Unconventional Pairing in Two Dimensions
Akinori Tanaka, Masanori Yamanaka
We rigorously prove that an extended Hubbard model with attraction in two dimensions has an unconventional pairing ground state for any electron filling. The anisotropic spin-0 or…
Gapless Excitation above a Domain Wall Ground State in a Flat Band Hubbard Model
Makoto Homma, Chigak Itoi
We construct a set of exact ground states with a localized ferromagnetic domain wall and with an extended spiral structure in a deformed flat-band Hubbard model in arbitrary dimens…