Metal-insulator transition in half-filling two-orbital Hubbard model on triangular lattice

Details Metal-insulator transition in half-filling two-orbital Hubbard model on triangular lattice Metal-insulator transition in half-filling two-orbital Hubbard model on triangular lattice

2007-09-26

arxiv.org/abs/0709.4108v2

Phys. Rev. B77, 125117 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 figures,13 pages, published version

Scientific paper

10.1103/PhysRevB.77.125117

We have investigated the half-filling two-orbital Hubbard model on a triangular lattice by means of the dynamical mean-field theory (DMFT). The densities of states and optical conductivity clearly show the occurence of metal-insulating transition (MIT) at U$_{c}$, U$_{c}$=18.2, 16.8, 6.12 and 5.85 for J=0, 0.01U, U/4 and U/3, respectively. The distinct continuities of double occupation of electrons, local square moments and local susceptibility of the charge, the spin and the orbital at J > 0 suggest that the MIT is the first-order; however at J=0, the MIT is the second-order in the half-filling two-orbital Hubbard model on triangular lattices. We attribute the first-order nature of the MIT to the low symmetry of the systems with finite Hund's coupling J.

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