Low Temperature Physics: 32, 457 (2006); https://doi.org/10.1063/1.2199448 (5 pages)
Физика Низких Температур: Том 32, Выпуск 4-5 (Апрель 2006), c. 602-608    ( к оглавлению , назад )

Correlated band structure of electron-doped cuprate materials

C. Dahnken1, M. Potthoff1, E. Arrigoni2, and W. Hanke1,3

1Institute for Theoretical Physics and Astrophysics, University of Würzburg, am Hubland, Würzburg 97074, Germany
E-mail: arriqoni@itp.tu-graz.ac.at

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

3Kavli 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 = 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 (artificially) introduce a doping-dependent on-site interaction U.

74.25.Jb - Electronic structure
74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds)

Ключевые слова: High-Tc superconductivity, cuprate materials, electron correlations.