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Correlated band structure of electron-doped cuprate materials
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Correlated band structure of electron-doped cuprate materials
Тема:
Strong Correlations
Інший ID:
PACS: 74.25.Jb, 74.72.—h
Посилання:
Correlated band structure of electron-doped cuprate
materials / C. Dahnken, M. Potthoff, E. Arrigoni, W. Hanke // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 602– 608. — Бібліогр.: 33 назв. — англ.
Підтримка:
The authors would like to acknowledge support
by the DFG-Forschergruppe: Doping-dependence of
phase transitions and ordering phenomena in cuprate superconductors (FOR 538), and by the Bavarian
KONWHIR project CUHE. This research was supported
in part by the National Science Foundation
under Grant No. PHY99-0794. One of us (WH)
would like to acknowledge the warm hospitality of the
Kavli Institute for Theoretical Physics in Santa Barbara,
where part of this work was concluded.
Дата:
2006
Переглядів:
783
Завантажень:
367
Анотація:
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.
