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

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