Band renormalization and Fermi surface reconstruction in iron-based superconductors

Details Band renormalization and Fermi surface reconstruction in iron-based superconductors Band renormalization and Fermi surface reconstruction in iron-based superconductors

2009-01-07

arxiv.org/abs/0901.0821v1

Phys. Rev. B 79, 064517 (2009)

Physics

Condensed Matter

Superconductivity

16 pages, 6 figures

Scientific paper

10.1103/PhysRevB.79.064517

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.

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