Non-local correlations in the orbital selective Mott phase of a one dimensional multi-orbital Hubbard model

Abstract

We study non-local correlations in a three-orbital Hubbard model defined on an extended one-dimensional chain using determinant quantum Monte Carlo and density matrix renormalization group methods. We focus on a parameter with robust Hund's coupling, which produces an orbital selective Mott phase (OSMP) at intermediate values of the Hubbard U, as well as an orbitally ordered ferromagnetic insulating state at stronger coupling. An examination of the orbital and spin-correlation functions indicates that the orbital ordering occurs before the onset of magnetic correlations in this parameter regime as a function of temperature. In the OSMP, we find that the self-energy for the itinerant electrons is momentum dependent, indicating a degree of non-local correlations while the localized electrons have largely momentum independent self-energies. These non-local correlations also produce relative shifts of the hole-like and electron-like bands within our model. The overall momentum dependence of these quantities is strongly suppressed in the orbitally-ordered insulating phase.

we have 12 pages and 9 figures

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Cited by in corpus (11)

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• Density matrix renormalization group study of a three-orbital Hubbard model with spin-orbit coupling in one dimension
• SmoQyDQMC.jl: A flexible implementation of determinant quantum Monte Carlo for Hubbard and electron-phonon interactions (version 2.0 release)
• Block orbital-selective Mott insulators: a spin excitation analysis
• Stability of the novel interorbital-hopping mechanism for ferromagnetism in multi-orbital Hubbard models
• Magnetic-order-driven metal-insulator transitions in the quasi-one-dimensional spin-ladder compounds BaFe${}_2$S${}_3$ and BaFe${}_2$Se${}_3$
• Excitonic density-waves, bi-excitons and orbital selective pairing in two-orbital correlated chains
• Novel Block Excitonic Condensate at $n=3.5$ in a Spin-Orbit Coupled $t_{2g}$ Multiorbital Hubbard Model
• Electronic and spin dynamics in the insulating iron pnictide NaFe${}_{0.5}$Cu${}_{0.5}$As
• PhD Thesis: Electronic correlations in multiorbital systems
• Eliminating Orbital Selectivity from the Metal-Insulator Transition by Strong Magnetic Fluctuations