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