Slave-boson theory of the Mott transition in the two-band Hubbard model
arXiv:cond-mat/0508691 · doi:10.1140/epjb/e2005-00382-1
Abstract
We apply the slave-boson approach of Kotliar and Ruckenstein to the two-band Hubbard model with an Ising like Hund's rule coupling and bands of different widths. On the mean-field level of this approach we investigate the Mott transition and observe both separate and joint transitions of the two bands depending on the choice of the inter- and intraorbital Coulomb interaction parameters. The mean-field calculations allow for a simple physical interpretation and can confirm several aspects of previous work. Beside the case of two individually half-filled bands we also examine what happens if the original metallic bands possess fractional filling either due to finite doping or due to a crystal field which relatively shifts the atomic energy levels of the two orbitals. For appropriate values of the interaction and of the crystal field we can observe a a band insulating state and a ferromagnetic metal.
References in corpus (4)
Cited by in corpus (31)
- Orbital-Selective Mott transition out of band degeneracy lifting
- Rotationally-invariant slave-boson formalism and momentum dependence of the quasiparticle weight
- Orbital-selective Mott transitions: Heavy fermions and beyond
- Z_2-slave-spin theory for strongly correlated fermions
- Ni-based transition-metal trichalcogenide monolayer: a strongly correlated quadruple-layer graphene
- Nodeless high-T superconductivity in highly-overdoped monolayer CuO
- Quantum phase transition in the two-band Hubbard model
- Strongly renormalized quasi-two-dimensional electron gas in a heterostructure with correlation effects
- Orbital-selective Mott Transitions in a Doped Two-band Hubbard Model
- Mott transition of fermionic mixtures with mass imbalance in optical lattices
- Metal-insulator transition in the two-orbital Hubbard model at fractional band fillings: Self-energy functional approach
- Orbital-selective Mott transitions in a doped two-band Hubbard model with crystal field splitting
- Quantum phase transitions in the extended periodic Anderson model
- Microscopic Theory of Superconducting Phase Diagram in Infinite-Layer Nickelates
- Determinant Quantum Monte Carlo Study of the Orbitally Selective Mott Transition
- Slave boson theory of the extended Falicov-Kimball model
- Two-orbital Systems with Crystal Field Splitting and Interorbital Hopping
- Assessing the orbital selective Mott transition with variational wave functions
- Competition of crystal field splitting and Hund's rule coupling in two-orbital magnetic metal-insulator transitions
- Ionic Hubbard model on a triangular lattice for Na_0.5CoO_2, Rb_0.5CoO_2 and K_0.5CoO_2: Mean-field slave boson theory
- Unconventional High Temperature Superconductivity in Cubic Zinc-blende Transition Metal Compounds
- Mott transitions in a three-component Falicov-Kimball model: A slave boson mean-field study
- Finite f-Electron Bandwidth in a Heavy Fermion Model
- Self-doped Molecular Mott Insulator for Bilayer High-Temperature Superconducting La3Ni2O7
- Magnetic and orbital correlations in a two-site molecule
- Partial localization of correlated electrons: spin dependent masses, saturated ferromagnetism, and effective s-d model
- Hund's metal regimes and orbital selective Mott transitions in three band systems
- Mott transition, magnetic and orbital orders in the ground state of the two-band Hubbard model using variational slave-spin mean field formalism
- Bad metal and negative compressibility transitions in a two-band Hubbard model
- Low-energy structure and topology of the two-band Hubbard-Kanamori model
- Interplay of metamagnetic and structural transitions in CaSrRuO