Band renormalization and Fermi surface reconstruction in iron-based superconductors

Abstract

Using the fluctuation exchange approximation and a three-orbital model, we study the band renormalization, Fermi surface reconstruction and the superconducting pairing symmetry in the newly-discovered iron-based superconductors. We find that the inter-orbital spin fluctuations lead to the strong anisotropic band renormalization and the renormalization is orbital dependent. As a result, the topology of Fermi surface displays distinct variation with doping from the electron type to the hole type, which is consistent with the recent experiments. This shows that the Coulomb interactions will have a strong effect on the band renormalization and the topology of the electron Fermi pocket. In addition, the pairing state mediated by the inter-orbital spin fluctuation is of an extended s-wave symmetry.

16 pages, 6 figures

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• Momentum dependence and nodes of the superconducting gap in iron-pnictides
• Antiferromagnetically Driven Electronic Correlation in Iron Pnictides and Cuprates
• Renormalization group analysis of competing orders and the pairing symmetry in Fe-based superconductors
• Ambegaokar-Baratoff relations of Josephson critical current in heterojunctions with multi-gap superconductors
• Magnetic order in orbital models of the iron pnictides
• Effects of Disorder in FeSe : An Ab Initio Study
• Possible singlet and triplet superconductivity on honeycomb lattice
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• Fermi arcs, pseudogap and collective excitations in doped Sr2IrO4: A generalized fluctuation exchange study
• A Twisted Ladder: relating the Fe superconductors to the high $T_c$ cuprates
• Band-filling and correlation controlling electronic properties and magnetism in K${}_x$Fe${}_{2-y}$Se${}_2$: A slave boson study
• Effects of the vortices and impurities on the nuclear spin relaxation rate in iron-based superconductors
• Thermoelectricity and electronic correlations enhancement in FeS by slight Se substitution
• Spin density wave in oxypnictide superconductors in a three-band model
• Metal-insulator transition and superconductivity in the two-orbital Hubbard-Holstein model for iron-based superconductors
• Orbital-transverse density-wave instabilities in iron-based superconductors
• Spin fluctuations and pairing symmetry in A${}_x$Fe${}_{2-y}$Se${}_2$: dual effect of the itinerant and the localized nature of electrons
• Robust $s_{\pm }$-wave superconductivity against multi-impurity in iron-based superconductors
• Mixed-State Effect on the Low-Energy Spin Dynamics in Optimally-doped Iron Pnictide Superconductors