Analytical slave-spin mean-field approach to orbital selective Mott insulators

Abstract

We use the slave-spin mean-field approach to study particle-hole symmetric one- and two-band Hubbard models in presence of Hund's coupling interaction. By analytical analysis of Hamiltonian, we show that the locking of the two orbitals vs.\,orbital-selective Mott transition can be formulated within a Landau-Ginzburg framework. By applying the slave-spin mean-field to impurity problem, we are able to make a correspondence between impurity and lattice. We also consider the stability of the orbital selective Mott phase to the hybridization between the orbitals and study the limitations of the slave-spin method for treating inter-orbital tunnellings in the case of multi-orbital Bethe lattices with particle-hole symmetry.

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• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Is the orbital-selective Mott phase stable against interorbital hopping?
• Are Heavy Fermion Strange Metals Planckian?
• Emergent low-energy bound states in the two-orbital Hubbard model
• Symmetry Breaking in Occupation Number Based Slave-Particle Methods
• Renormalized dispersing multiplets in the spectrum of nearly Mott localized systems
• Orbital-selective bad metals due to Hund's rule and orbital anisotropy: a finite-temperature slave-spin treatment of the two-band Hubbard model
• Orbital-selective correlations and renormalized electronic structure in LiFeAs
• Spontaneous layer selective Mott phase in the bilayer Hubbard model
• Manumitting slave-spins in the Anderson impurity model
• Correlation-driven Lifshitz transition and orbital order in a two-band Hubbard model
• Low-energy interband Kondo bound states in orbital-selective Mott phases
• Triplet pairing, orbital selectivity and correlations in Iron-based superconductors
• Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs