Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-06-06
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 9 figures
Scientific paper
10.1103/PhysRevB.66.165107
Electron correlations in the two-orbital Hubbard model at half-filling are investigated by combining dynamical mean field theory with the exact diagonalization method. We systematically study how the interplay of the intra- and inter-band Coulomb interactions, together with the Hund coupling, affects the metal-insulator transition. It is found that if the intra- and inter-band Coulomb interactions are nearly equal, the Fermi-liquid state is stabilized due to orbital fluctuations up to fairly large interactions, while the system is immediately driven to the Mott insulating phase away from this condition. The effects of the isotropic and anisotropic Hund coupling are also addressed.
Imai Yoshiki
Kawakami Norio
Koga Akihisa
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