The rich novel materials class of iron based superconductors turned out to exhibit a very complex electronic structure, despite of the simplicity of their crystal structures. For various approaches to study the instability against magnetic order or superconductivity, a real space description of the electronic structure is required. Here, the bonding situation and the orbital structure of the electronic state are analyzed and minimum tight-binding models quantitatively correctly describing the low-energy electronic structure are provided.
@article{arxiv.0905.4844,
title = {Tight-binding models for the new iron based superconductor materials},
author = {H. Eschrig and K. Koepernik},
journal= {arXiv preprint arXiv:0905.4844},
year = {2013}
}