### Correlated band structure of electron-doped cuprate materials

**C. Dahnken**^{1}, M. Potthoff^{1}, E. Arrigoni^{2}, and W. Hanke^{1,3}

^{1}Institute for Theoretical Physics and Astrophysics, University of Würzburg, am Hubland, Würzburg 97074, Germany

E-mail: arriqoni@itp.tu-graz.ac.at

^{2}Institute for Theoretical Physics and Computational Physics, Graz University of Technology, Graz, A-8010, Austria

^{3}Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030, USA

E-mail: hanke@physik.uni-wuerzburg.de

*Received August 25, 2005*

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-energyfunctional
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* = 8*t* 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 (artificially) introduce a doping-dependent on-site interaction *U*.