Mott transitions in correlated electron systems with orbital degrees of freedom

Abstract

Mott metal-insulator transitions in an M-fold orbitally degenerate Hubbard model are studied by means of a generalization of the linearized dynamical mean-field theory. The method allows for an efficient and reliable determination of the critical interaction U_c for any integer filling n and different M at zero temperature. For half-filling a linear dependence of U_c on M is found. Inclusion of the (full) Hund's rule exchange J results in a strong reduction of U_c. The transition turns out to change qualitatively from continuous for J=0 to discontinuous for any finite J.

References in corpus (6)

• Mott-Hubbard Metal-Insulator Transition in Paramagnetic V_2O_3: a LDA+DMFT(QMC) Study
• Two-site dynamical mean-field theory
• Mott transition at large orbital degeneracy: dynamical mean-field theory
• Stability of a metallic state in the two-orbital Hubbard model
• Critical behaviour near the metal-insulator transition of a doped Mott insulator
• Critical Behaviour near the Mott Metal-Insulator Transition in a Two-band Hubbard Model

Cited by in corpus (62)

• Electronic Structure Calculations with Dynamical Mean-Field Theory: A Spectral Density Functional Approach
• Dynamical Mean-Field Theory within an Augmented Plane-Wave Framework: Assessing Electronic Correlations in the Iron Pnictide LaFeAsO
• Orbital-selective Mott transitions in the degenerate Hubbard model
• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
• Rotationally-invariant slave-boson formalism and momentum dependence of the quasiparticle weight
• Self-energy-functional approach: Analytical results and the Mott-Hubbard transition
• Hund's coupling and the metal-insulator transition in the two-band Hubbard model
• Kondo resonance narrowing in d- and f-electron systems
• Spin, charge and orbital fluctuations in a multi-orbital Mott insulator
• Dynamical behavior across the Mott transition of two bands with different bandwidths
• Orbital-selective Mott-Hubbard transition in the two-band Hubbard model
• Mott Transition in Multi-Orbital Models for Iron Pnictides
• Effect of Crystal-Field Splitting and Inter-Band Hybridization on the Metal-Insulator Transitions of Strongly Correlated Systems
• Hierarchical equations of motion for impurity solver in dynamical mean-field theory
• Finite-temperature Mott transitions in multi-orbital Hubbard model
• Krylov implementation of the hybridization expansion impurity solver and application to 5-orbital models
• Quantum Monte Carlo study for multiorbital systems with preserved spin and orbital rotational symmetries
• Nonlocal correlations induced by Hund's coupling: a cluster DMFT study
• Superconductivity in the two-band Hubbard model
• Modeling many-body physics with Slave-Spin Mean-Field: Mott and Hund's physics in Fe-superconductors
• Two-site fluctuations and multipolar superexchange interactions in strongly correlated systems
• 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
• Mott Transitions of Three-Component Fermionic Atoms with Repulsive Interaction in Optical Lattices
• Metal-insulator transitions, superconductivity, and magnetism in the two-band Hubbard model
• Mott transitions in the multi-orbital systems
• Phase diagram of orbital-selective Mott transitions at finite temperatures
• Quantum phase transitions in the extended periodic Anderson model
• First-order metal-insulator transitions in the extended Hubbard model due to self-consistent screening of the effective interaction
• Finite Temperature Phase Transitions in the SU$(N)$ Hubbard model
• Effects of interorbital hopping on orbital fluctuations and metal-insulator transitions: Extended linearized dynamical mean-field theory
• Mott transitions in the half-filled SU(2M) symmetric Hubbard model
• Mott Quantum Critical Points at finite doping
• Effects of degenerate orbitals on the Hubbard model
• Periodic Anderson model with degenerate orbitals: linearized dynamical mean field theory approach
• Filling-driven Mott transition in SU(N) Hubbard models
• Extended regime of coexisting metallic and insulating phases in a two-orbital electronic system
• Enhancement of charge instabilities in Hund's metals by the breaking of rotational symmetry
• On the nature of the Mott transition in multiorbital systems
• Effect of Hund's exchange on the spectral function of a triply orbital degenerate correlated metal
• Hybridizing localized and itinerant electrons: a recipe for pseudogaps
• Localised Wannier orbital basis for the Mott insulators GaV4S8 and GaTa4Se8
• Dynamical Mean-Field Theory - from Quantum Impurity Physics to Lattice Problems
• 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
• Spectral Weight Transfer in Multi-Orbital Mott Systems
• Slave-spin mean field for broken-symmetry states: Néel antiferromagnetism and its phase separation in multi-orbital Hubbard models
• Local correlation effects on the s+-- and s++-wave superconductivities mediated by magnetic and orbital fluctuations in the 5-orbital Hubbard model for iron pnictides
• Metal-insulator transition in half-filling two-orbital Hubbard model on triangular lattice
• Enhanced Spin-Orbit Coupling in a Correlated Metal
• Magnetic and orbital correlations in a two-site molecule
• Destabilization of ferromagnetism by frustration and realization of a nonmagnetic Mott transition in the quarter-filled two-orbital Hubbard model
• Metal-insulator transition and superconductivity in the two-orbital Hubbard-Holstein model for iron-based superconductors
• Magnetic transitions in strong coupling expansions for nearly degenerate states
• Density-Wave and Antiferromagnetic States of Fermionic Atoms in Optical Lattices
• Bath parameterization in multi-band cluster Dynamical Mean-Field Theory
• Quantitative Determination of the Critical Points of Mott Metal-Insulator Transition in Strongly Correlated Systems
• Itinerant ferromagnetism in an SU(3) Fermi-Hubbard model at finite temperatures: A dynamical mean-field theory study
• Mott transition, magnetic and orbital orders in the ground state of the two-band Hubbard model using variational slave-spin mean field formalism
• Mean-field phase diagram of interacting e_g electrons
• Generalized Nagaoka ferromagnetism accompanied by flavor-selective Mott states in an SU($N$) Fermi-Hubbard model
• Hund's metallicity enhanced by van Hove singularity in cubic perovskite systems