Nematicity at the Hund's metal crossover in iron superconductors

Abstract

The theoretical understanding of the nematic state of iron-based superconductors and especially of FeSe is still a puzzling problem. Although a number of experiments calls for a prominent role of local correlations and place iron superconductors at the entrance of a Hund metal state, the effect of the electronic correlations on the nematic state has been theoretically poorly investigated. In this work we study the nematic phase of iron superconductors accounting for local correlations, including the effect of the Hund's coupling. We show that Hund's physics strongly affects the nematic properties of the system. It severely constraints the precise nature of the feasible orbital-ordered state and induces a differentiation in the effective masses of the zx=yz orbitals in the nematic phase. The latter effect leads to distinctive signatures in different experimental probes, so far overlooked in the interpretation of experiments. As notable examples the splittings between zx and yz bands at Gamma and M points are modified, with important consequences for ARPES measurements.

The title, the text and the figures have been modified with respect to the first version. 8 pages (6 pages + references), 3 pdf figures

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• Superconductivity in FeSe: the role of nematic order
• Charge disproportionation, mixed valence, and Janus effect in multiorbital systems: A tale of two insulators
• Orbital selectivity enhanced by nematic order in FeSe
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Nematicity, magnetism and superconductivity in FeSe under pressure: Unified explanation based on the self-consistent vertex correction theory
• Origin of diverse nematic orders in Fe-based superconductors: 45${}^{\circ }$ rotated nematicity in AFe${}_2$As${}_2$ (A=Cs, Rb)
• Orbital mismatch boosting nematic instability in iron-based superconductors
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Time-reversal symmetry-breaking nematic superconductivity in FeSe
• Superconductivity without hole-pocket in electron-doped FeSe: Analysis beyond the Migdal-Eliashberg formalism
• Superconductivity-induced nematicity
• Orbital order in FeSe - the case for vertex renormalization
• Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
• Spin-Orbital-Intertwined Nematic State in FeSe
• $SU(4)$ Valley + Spin Fluctuation Interference Mechanism for Nematic Order in Magic Angle Twisted Bilayer Graphene: Impact of Vertex Corrections
• Differentiating Hund from Mott physics in a three-band Hubbard-Hund model: Temperature dependence of spectral, transport, and thermodynamic properties
• Hund physics landscape of two-orbital system
• Efficient computational screening of strongly correlated materials -- Multi-orbital phenomenology within the ghost Gutzwiller approximation
• Synergy between Hund-driven correlations and boson-mediated Superconductivity
• Orbital-dependent self-energy effects and consequences for the superconducting gap structure in multi-orbital correlated electron systems
• Hidden antiferro-nematic order in Fe-based superconductor BaFe${}_2$As${}_2$ and NaFeAs above $T_S$
• Strong electronic correlations and Fermi surface reconstruction in the quasi-one dimensional iron superconductor BaFe2S3
• Nonlocal Coulomb interaction and spin-freezing crossover as a route to valence-skipping charge order
• Anisotropic quasiparticle coherence in nematic BaFe${}_2$As${}_2$ studied with strain-dependent ARPES
• Driving force of the orbital-relevant electronic nematicity in Fe-based superconductors
• Nematic Fluctuations in an Orbital Selective Superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Strong enhancement of magnetic order from bulk to stretched monolayer FeSe as Hund's metals
• Anisotropy of the DC conductivity due to orbital-selective spin fluctuations in the nematic phase of iron superconductors
• Orbital-selective correlations and renormalized electronic structure in LiFeAs
• Nematic spectral signatures of the Hund's metal
• Three-dimensional bond-order instability in infinite-layer nickelates due to nonlocal quantum interference
• Uniaxial stress effect on the electronic structure of quantum materials
• Unconventional orbital-charge density wave mechanism in transition metal dichalcogenide 1T-TaS2
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Photoinduced nematic state in FeSe${}_{0.4}$Te${}_{0.6}$
• Ultrafast orbital manipulation and Mott physics in multi-band correlated materials
• The driving mechanism of the d-wave orbital order in the iron-based superconductors
• Hund's coupling and electronic anisotropy in the spin-density wave state of iron pnictides
• Energy-Resolved Real-Space Imaging of Orbital Nematicity in an Fe-Based Superconductor
• PhD Thesis: Electronic correlations in multiorbital systems