Non-local correlations in Iron Pnictides and Chalcogenides

Abstract

Deviations of low-energy electronic structure of iron-based superconductors from density functional theory predictions have been parametrized in terms of band- and orbital-dependent mass renormalizations and energy shifts. The former have typically been described in terms of a local self-energy within the framework of dynamical mean field theory, while the latter appears to require non-local effects due to interband scattering. By calculating the renormalized bandstructure in both random phase approximation (RPA) and the two-particle self-consistent approximation (TPSC), we show that correlations in pnictide systems like LaFeAsO and LiFeAs can be described rather well by a non-local self-energy. In particular, Fermi pocket shrinkage as seen in experiment occurs due to repulsive interband finite-energy scattering. For the canonical iron chalcogenide system FeSe in its bulk tetragonal phase, the situation is however more complex since even including momentum-dependent band renormalizations cannot explain experimental findings. We propose that the long-range Coulomb interaction may play an important role in band-structure renormalization in FeSe. We further compare our evaluations of non-local quasiparticle scattering lifetime within RPA and TPSC with experimental data for LiFeAs.

arXiv comment12 Pages, 8 figures

References in corpus (41)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• Non-perturbative many-body approach to the Hubbard model and single-particle pseudogap
• Superconductivity without magnetism in LiFeAs
• Proximity of antiferromagnetism and superconductivity in LaO${}_{1-x}$F${}_x$FeAs: effective Hamiltonian from ab initio studies
• Theoretical evidence for strong correlations and incoherent metallic state in FeSe
• Tight-binding models for the new iron based superconductor materials
• The key ingredients of the electronic structure of FeSe
• Fermi surface of superconducting LaFePO determined by quantum oscillations
• Phase diagram and Gap anisotropy in Iron-Pnictide Superconductors
• Magnetism, superconductivity, and spontaneous orbital order in iron-based superconductors: who comes first and why?
• Non-analytic corrections to the Fermi-liquid behavior
• Evidence for unidirectional nematic bond ordering in FeSe
• Orbital-dependent Fermi Surface shrinking as a fingerprint of nematicity in FeSe
• Effects of correlation in LiFeAs
• Many-body effects in iron pnictides and chalcogenides -- non-local vs dynamic origin of effective masses
• Asymmetric band widening by screened exchange competing with local correlations in SrVO3: new surprises on an old compound from combined GW and dynamical mean field theory GW+DMFT
• Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx
• Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
• Interatomic Coulomb interaction and electron nematic bond order in FeSe
• Suppression of electronic correlations by chemical pressure from FeSe to FeS
• The Nematic Energy Scale and the Missing Electron Pocket in FeSe
• Orbital selective Fermi surface shifts and mechanism of high T${}_c$ superconductivity in correlated AFeAs (A=Li,Na)
• Large temperature dependence of the number of carriers in Co-doped BaFe2As2
• A de Haas-van Alphen study of the Fermi surfaces of superconducting LiFeP and LiFeAs
• Superconducting gap in LiFeAs from three-dimensional spin-fluctuation pairing calculations
• Surface-driven electronic structure in LaFeAsO studied by angle resolved photoemission spectroscopy
• Anomalous temperature evolution of the electronic structure of FeSe
• Spectral properties of transition metal pnictides and chalcogenides: angle-resolved photoemission spectroscopy and dynamical mean field theory
• Anisotropic quasiparticle lifetimes in Fe-based superconductors
• Interplay of nematic and magnetic orders in FeSe under pressure
• Effect of non-local correlations on the electronic structure of LiFeAs
• Unconventional Hall effect in pnictides from interband interactions
• Effect of electron correlations on the electronic structure and phase stability of FeSe upon lattice expansion
• Extended Hubbard model of superconductivity driven by charge fluctuations in iron-pnictides
• Evidence of hot and cold spots on the Fermi surface of LiFeAs
• ARPES view of orbitally resolved quasiparticle lifetimes in iron pnictides
• Electronic structure properties in the nematic phases of FeSe

Cited by in corpus (21)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe${}_4$As${}_4$
• Nonequilibrium Two-Particle Self-Consistent Approach
• Two-Particle Self-Consistent method for the multi-orbital Hubbard model
• Orbital-dependent self-energy effects and consequences for the superconducting gap structure in multi-orbital correlated electron systems
• Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe
• Nonlocal corrections to dynamical mean-field theory from the two-particle self-consistent method
• On the Spatial Locality of Electronic Correlations in LiFeAs
• Anisotropy of electronic correlations: On the applicability of local theories to layered materials
• Improved effective vertices in the multi-orbital Two-Particle Self-Consistent method from Dynamical Mean-Field Theory
• The Three-Dimensional Electronic Structure of LiFeAs: Strong-coupling Superconductivity and Topology in the Iron Pnictides
• Dynamical Mean Field Theory extension to the nonequilibrium Two-Particle Self-Consistent approach
• Prediction of Double-Weyl Points in the Iron-Based Superconductor CaKFe${}_4$As${}_4$
• Accurate modeling of FeSe with screened Fock exchange and Hund's metal correlations
• Spatial non-locality of electronic correlations beyond GW approximation
• Orbital-selective correlations and renormalized electronic structure in LiFeAs
• Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements
• Multi-orbital two-particle self-consistent approach -- strengths and limitations
• The Hund's Superconductor Li(Fe,Co)As
• Looking Beyond the Surface with Angle-Resolved Photoemission Spectroscopy
• Symmetry-breaking-induced topology in FeSe