We investigate superconductivity in a two-orbital Hubbard model on a square lattice by
applying fluctuation exchange approximation. In the present model, the symmetry of the two …

accepted September 24, 2008; published December 10, 2008) Superconductivity and
magnetism in the non-centrosymmetric heavy fermion compound CePt3Si and related …

The energetics of the interplay between superconductivity and the pseudogap in high-
temperature superconductivity is examined using the eight-site dynamical cluster …

accepted May 31, 2005) We analyze the normal electronic states of Na0: 35CoO2 based on
the effective d–p model with a full dorbital freedom using the fluctuation-exchange (FLEX) …

The dynamical mean-field theory (DMFT) combined with the fluctuation exchange (FLEX)
method, namely, FLEX+ DMFT, is an approach for correlated electron systems to incorporate …

A systematic diagrammatic expansion for Gutzwiller-wave functions (DE-GWF) is formulated
and used for the description of superconducting (SC) ground state in the two-dimensional …

Spin and charge fluctuations and superconductivity in Na x CoO 2· y H 2 O are studied
based on a multiorbital Hubbard model. Tight-binding parameters are determined to …

To examine the insulating mechanism of 5 d transition metal oxide Sr 2 IrO 4, we study the
ground state properties of a three-orbital Hubbard model with a large relativistic spin-orbit …

The electronic structure of Na x CoO 2 revealed by recent photoemission experiments
shows important deviations from band theory predictions. The six small Fermi surface …

Superconductivity arises mostly at energy and temperature scales that are much smaller
than the typical bare electronic energies. Since the computational effort of diagrammatic …