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

Abstract

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.

arXiv comment5 figures,13 pages, published version

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Cited by in corpus (2)

• Electronic correlation-driven orbital polarization transitions in the orbital-selective Mott compound Ba${}_2$CuO${}_{4-\delta }$
• Efficient treatment of the high-frequency tail of the self-energy function and its relevance for multi-orbital models