Magnetism and Mott Transition: A Slave-rotor Study

Abstract

Motivated by the debate of spin-density-wave (SDW) versus local-moment (LM) picture in the iron-based superconducting (FeSC) materials, we consider a two-band orbital-symmetric Hubbard model in which there is robust Fermi surface nesting at $(\pi ,0)$. We obtain the phase diagram of such system by a mean-field slave-rotor approach, in which the Fermi surface nesting and the SDW order are explicitly taken into account via a natural separation of scale between the Hund's coupling and the Coulomb interaction. We find that for a sizable range of Hund's coupling the Mott transition acquires a strong first-order character, but there also exists a small range of stronger Hund's coupling in which an enhancement of magnetization can be observed on the SDW side. We interpret the former scenario as one in which a sharp distinction can be drawn between LM and the SDW picture, and the latter scenario as one in which signs of LM physics begin to develop in the metallic phase. It is tempting to suggest that some FeSC materials are in the vicinity of the latter scenario.

7 pages, 5 figures; v2: Added discussions on anisotropy in renormalized hopping, clarifications and discussions with regard to orbital order, new inset in Fig. 3(d), expanded and revised bibliography, plus other minor revisions. Accepted to PRB

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• Anomalous enhancement of Wilson ratio in a quantum spin liquid with strong spin-orbital entanglement: the case of Na4Ir3O8
• Non-renewal statistics for electron transport in a molecular junction with electron-vibration interaction
• Influence of spin fluctuations near the Mott transition: a DMFT study
• Slave-rotor theory on magic-angle twisted bilayer graphene
• Slave rotor approach to dynamically screened Coulomb interactions in solids
• Influence of electronic correlations on orbital polarizations in the parent and doped iron pnictides
• Emergence of Spinon Fermi Arcs in the Weyl-Mott Metal-Insulator Transition
• Dilemma in strongly correlated materials: Hund's metal vs relativistic Mott insulator
• Feasibility of a metamagnetic transition in correlated systems
• Topological strongly correlated phases in orthorhombic diamond lattice compounds
• Bond-dependent slave-particle cluster theory based on density matrix expansion
• Mott transition and correlation effects on strictly localized states in an octagonal quasicrystal
• Band antiferromagnetism in a two-band model for iron pnictides