We suggest a model for electronic structure of cuprate superconductors that makes it possible to describe evolution of this structure with the doping and provides a new explanation for a number of typical features of cuprates, including the pseudogap and the Fermi arcs. According to this model, the unique electronic structure of cuprates is favorable for the formation of two-atomic negative-U centers (NUCs) and realization of a peculiar mechanism of the electron-electron interaction.
@article{arxiv.1011.3623,
title = {Model for the electronic structure, Fermi arcs, and pseudogap in cuprate superconductors},
author = {K. V. Mitsen and O. M. Ivanenko},
journal= {arXiv preprint arXiv:1011.3623},
year = {2011}
}