Tight binding model for iron pnictides

Abstract

We propose a five-band tight-binding model for the Fe-As layers of iron pnictides with the hopping amplitudes calculated within the Slater-Koster framework. The band structure found in DFT, including the orbital content of the bands, is well reproduced using only four fitting parameters to determine all the hopping amplitudes. The model allows to study the changes in the electronic structure caused by a modification of the angle $\alpha$ formed by the Fe-As bonds and the Fe-plane and recovers the phenomenology previously discussed in the literature. We also find that changes in $\alpha$ modify the shape and orbital content of the Fermi surface sheets.

12 pages, 6 eps figures. Figs 1 and 2 modified, minor changes in the text. A few references added

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• Coupling of the A_{1g} As-phonon to magnetism in iron pnictides
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• Validity of the Local Approximation in Iron- Pnictides and Chalcogenides
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• Tight-binding Hamiltonian for LaOFeAs
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• Constraints Imposed by Symmetry on Pairing Operators for the Pnictides
• Magneto-elastic coupling in Fe-based superconductors
• Comment on "Nonmagnetic Impurity Resonances as a Signature of Sign-Reversal Pairing in Fe-As-Based Superconductors"
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• PhD Thesis: Electronic correlations in multiorbital systems
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