We present a numerical study of the doping dependence of the spectral function of the n-type cuprates. Using a variational cluster-perturbation theory approach based upon the self-energy-functional theory, the spectral function of the electron-doped two-dimensional Hubbard model is calculated. The model includes the next-nearest neighbor electronic hopping amplitude t′ and a fixed on-site interaction U=8t at half filling and doping levels ranging from x=0.077 to x=0.20. Our results support the fact that a comprehensive description of the single-particle spectrum of electron-doped cuprates requires a proper treatment of strong electronic correlations. In contrast to previous weak-coupling approaches, we obtain a consistent description of the ARPES experiments without the need to introduce a doping-dependent on-site interaction U.
@article{arxiv.cond-mat/0504618,
title = {Correlated band structure of electron-doped cuprate materials},
author = {C. Dahnken and M. Potthoff and E. Arrigoni and W. Hanke},
journal= {arXiv preprint arXiv:cond-mat/0504618},
year = {2009}
}