Orbital differentiation in Hund metals

Abstract

Orbital differentiation is a common theme in multiorbital systems, yet a complete understanding of it is still missing. Here, we consider a minimal model for orbital differentiation in Hund metals with a highly accurate method: We use the numerical renormalization group as a real-frequency impurity solver for a dynamical mean-field study of three-orbital Hubbard models, where a crystal field shifts one orbital in energy. The individual phases are characterized with dynamic correlation functions and their relation to diverse Kondo temperatures. Upon approaching the orbital-selective Mott transition, we find a strongly suppressed spin coherence scale and uncover the emergence of a singular Fermi liquid and interband doublon-holon excitations. Our theory describes the diverse polarization-driven phenomena in the $t_{2g}$ bands of materials such as ruthenates and iron-based superconductors, and our methodological advances pave the way towards real-frequency analyses of strongly correlated materials.

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• Differentiating Hund from Mott physics in a three-band Hubbard-Hund model: Temperature dependence of spectral, transport, and thermodynamic properties
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• Block orbital-selective Mott insulators: a spin excitation analysis
• BaOsO${}_3$: A Hund's metal in the presence of strong spin-orbit coupling
• Orbital-selective Mott phase and non-Fermi liquid in FePS${}_3$
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• Complex Time Evolution in Tensor Networks
• Correlation strength and orbital differentiation across the phase diagram of plutonium metal
• Heavy-fermions in frustrated Hund's metal with portions of incipient flat-bands
• Can Orbital-Selective Néel Transitions Survive Strong Nonlocal Electronic Correlations?
• Tuning orbital-selective phase transitions in a two-dimensional Hund's correlated system
• Low-energy perspective on two-orbital Hund metals and the case of LaNiO2
• Signatures of Hund Metal and finite-frequency nesting in Sr${}_2$RuO${}_4$ Revealed by Electronic Raman Scattering
• Fermi-Liquid $T^2$ Resistivity: Dynamical Mean-Field Theory Meets Experiment
• Precise ground state of multi-orbital Mott systems via the variational discrete action theory
• Emergent spin-glass state in the doped Hund's metal CsFe2As2
• Novel subbands in the doped two-orbital Kanamori-Hubbard model
• Hund bands in spectra of multiorbital systems
• Interplay of charge and spin fluctuations in a Hund's coupled impurity
• Orbitally-selective Breakdown of the Fermi Liquid and Simultaneous Enhancement of Metallic and Insulating States in Correlated Multi-band Systems with Spin-orbit Coupling
• Testing the parquet equations and the U(1) Ward identity for real-frequency correlation functions from the multipoint numerical renormalization group
• Hund flat band in a frustrated spinel oxide
• Low-temperature transport in high-conductivity correlated metals: a density-functional plus dynamical mean-field study of cubic perovskites
• Impact of strong electronic correlations on altermagnets: the case of NiS2
• Low-energy interband Kondo bound states in orbital-selective Mott phases
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Real-Space Switching of Local Moments Driven by Quantum Geometry in Correlated Graphene Heterostructures
• Observation of Two Cascading Screening Processes in an Iron-based Superconductor
• Improved estimator for numerical renormalization group calculations of the self-energy
• Computing local multipoint correlators using the numerical renormalization group
• Quantitative determination of the orbital-selective Mott transition and quantum entanglement in the orbital-selective Mott phase
• Eliminating Orbital Selectivity from the Metal-Insulator Transition by Strong Magnetic Fluctuations
• Many-body electronic structure, self-doped double-exchange, and Hund metallicity in 1T-CrTe2 bulk and monolayer