Stability of a metallic state in the two-orbital Hubbard model

Abstract

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.

7 pages, 9 figures

References in corpus (5)

• Orbital Fluctuation-Induced Triplet Superconductivity : Mechanism of Superconductivity in ${\mathrm{Sr}}_2{\mathrm{RuO}}_4$
• Thermoelectric properties of the degenerate Hubbard model
• Mott transition and heavy fermion state in the pyrochlore Hubbard model
• Heavy Quasi-Particle in the Two-Orbital Hubbard Model
• Critical Behaviour near the Mott Metal-Insulator Transition in a Two-band Hubbard Model

Cited by in corpus (49)

• Strong electronic correlations from Hund's coupling
• Orbital-selective Mott transitions in the degenerate Hubbard model
• High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems
• Hund's coupling key role in multi-orbital correlations
• Hund's coupling and the metal-insulator transition in the two-band Hubbard model
• Spin, charge and orbital fluctuations in a multi-orbital Mott insulator
• Dynamical behavior across the Mott transition of two bands with different bandwidths
• Efficient DMFT impurity solver using real-time dynamics with Matrix Product States
• Efficient implementation of the Gutzwiller variational method
• Mott transitions in correlated electron systems with orbital degrees of freedom
• Generalization of the iterative perturbation theory and metal-insulator transition in multi-orbital Hubbard bands
• Finite-temperature Mott transitions in multi-orbital Hubbard model
• Field-induced phase transitions in a Kondo insulator
• Superconductivity in the two-band Hubbard model
• Orbital Order, Metal Insulator Transition, and Magnetoresistance-Effect in the two-orbital Hubbard model
• Electronic properties of alkali-metal loaded zeolites -- a "supercrystal" Mott insulator
• Metal-insulator transition in the two-orbital Hubbard model at fractional band fillings: Self-energy functional approach
• Excitonic BCS-BEC crossover at finite temperature: Effects of repulsion and electron-hole mass difference
• Properties of Gutzwiller wave-functions for multi-band models
• Mott transitions in the multi-orbital systems
• Quantum phase transitions in the extended periodic Anderson model
• Phase diagram of orbital-selective Mott transitions at finite temperatures
• Effects of interorbital hopping on orbital fluctuations and metal-insulator transitions: Extended linearized dynamical mean-field theory
• Finite Temperature Phase Transitions in the SU$(N)$ Hubbard model
• Mott transitions in the half-filled SU(2M) symmetric Hubbard model
• Effects of degenerate orbitals on the Hubbard model
• Phase diagram for the exciton Mott transition in infinite-dimensional electron-hole systems
• Periodic Anderson model with degenerate orbitals: linearized dynamical mean field theory approach
• Spontaneously orbital-selective superconductivity in a three-orbital Hubbard model
• Staggered ordered phases in the three-orbital Hubbard model
• On the nature of the Mott transition in multiorbital systems
• Multiband-Driven Superfluid-Insulator Transition of Fermionic Atoms in Optical Lattices: A Dynamical Mean-Field-Theory Study
• Interplay of orbitally polarized and magnetically ordered phases in doped transition metal oxides
• Phase transitions in the Hubbard model for the bismuth nickelate
• Excitonic Order and Superconductivity in the Two-Orbital Hubbard Model: Variational Cluster Approach
• Mott-Enhanced Exciton Condensation in a Hubbard bilayer
• Magnetic properties of a Kondo insulator with RKKY interaction: Extended dynamical mean field study
• Competition between reduced delocalization and charge transfer effects for a two-band Hubbard model
• Orbital-selective Mott phase of Cu-substituted iron-based Superconductors
• Efficient treatment of the high-frequency tail of the self-energy function and its relevance for multi-orbital models
• Density-Wave and Antiferromagnetic States of Fermionic Atoms in Optical Lattices
• Magnetic transitions in strong coupling expansions for nearly degenerate states
• Itinerant ferromagnetism in an SU(3) Fermi-Hubbard model at finite temperatures: A dynamical mean-field theory study
• Diagrammatic theory for twofold degenerate Anderson impurity model
• Bath parameterization in multi-band cluster Dynamical Mean-Field Theory
• Symmetry breaking states in the half-filled two-orbital Hubbard model with crystalline electric field
• Slope-Reversed Mott Transition in Multiorbital Systems
• Generalized Nagaoka ferromagnetism accompanied by flavor-selective Mott states in an SU($N$) Fermi-Hubbard model
• Metal-Insulator transition in optical lattice system with site-dependent interactions