Slave-spin mean field for broken-symmetry states: Néel antiferromagnetism and its phase separation in multi-orbital Hubbard models
arXiv:2301.10726 · doi:10.1103/PhysRevB.107.155149
Abstract
We introduce the generalization of the Slave-Spin Mean-Field method to broken-symmetry phases. Through a variational approach we derive the single-particle energy shift in the mean-field equations which generates the appropriate self-consistent field responsible for the stabilization of the broken symmetry. With this correction the different flavours of the slave-spin mean-field are actually the same method and they give identical results to Kotliar-Ruckenstein slave-bosons and to the Gutzwiller approximation. We apply our formalism to the Néel antiferromagnetic state and study it in multi-orbital models as a function of the number of orbitals and Hund's coupling strength, providing phase diagrams in the interaction-doping plane. We show that the doped antiferromagnet in proximity of half-filling is typically unstable towards insulator-metal and magnetic-non magnetic phase separation. Hund's coupling extends the range of this antiferromagnet, and favors its phase separation.
arXiv comment15 pages, 10 figures
References in corpus (35)
- Strong electronic correlations from Hund's coupling
- Experimental realization of a long-range antiferromagnet in the Hubbard model with ultracold atoms
- Mott transition, antiferromagnetism, and unconventional superconductivity in layered organic superconductors
- Selective Mottness as a key to iron superconductors
- Orbital selective Mott transition in multi-band systems: slave-spin representation and dynamical mean-field theory
- Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
- Rotationally-invariant slave-boson formalism and momentum dependence of the quasiparticle weight
- w2dynamics: Local one- and two-particle quantities from dynamical mean field theory
- Interplay of Mott Transition and Ferromagnetism in the Orbitally Degenerate Hubbard Model
- Sum-rules and bath-parametrization for quantum cluster theories
- U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides
- Superconductivity from emerging magnetic moments
- Static vs. dynamical mean field theory of Mott antiferromagnets
- Magnetism and Phase Separation in the Ground State of the Hubbard Model
- Electronic correlations in Hund metals
- Slave spin cluster mean field theory away from half-filling: Application to the Hubbard and the extended Hubbard Model
- Mott transitions in correlated electron systems with orbital degrees of freedom
- Z_2-slave-spin theory for strongly correlated fermions
- Mott transition at large orbital degeneracy: dynamical mean-field theory
- Electronic orders in multi-orbital Hubbard models with lifted orbital degeneracy
- Signature of antiferromagnetic long-range order in the optical spectrum of strongly correlated electron systems
- Mott-Hubbard insulators for systems with orbital degeneracy
- Orbital-selective Mott phase in multiorbital models for iron pnictides and chalcogenides
- A Simple Treatment of Metal-Insulator Transition: Effects of Degeneracy, Temperature and Applied Magnetic Field
- Slave-Boson Mean-Field Theory of the Antiferromagnetic State in the Doubly Degenerate Hubbard Model - the Half-Filled Case -
- From Hunds insulator to Fermi liquid: Optical spectroscopy study of K doping in BaMnAs
- Chromium analogues of Iron-based superconductors
- Antiferromagnetism of almost localized fermions: Evolution from Slater-type to Mott-Hubbard gap
- Slave-Boson analysis of the 2D Hubbard model
- Mott Quantum Critical Points at finite doping
- Electronic state of a doped Mott-Hubbard insulator at finite temperatures studied using the dynamical mean-field theory
- Enhancement of charge instabilities in Hund's metals by the breaking of rotational symmetry
- Symmetry Breaking in Occupation Number Based Slave-Particle Methods
- Revisit of Antiferromagnetism in Hubbard Model by A Cluster Slave-Spin Method
- Boson Slave Solver (BoSS) v1.1