Underdoped cuprates phenomenology in the 2D Hubbard model within COM(SCBA)

Thumbnail Image

Date

Authors

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Description

The two-dimensional Hubbard model is studied within the Composite Operator Method (COM) with the residual self-energy computed in the Self-Consistent Born Approximation (SCBA). COM describes interacting electrons in terms of the new elementary excitations appearing in the system owing to strong correlations; residual interactions among these excitations are treated within the SCBA. The anomalous features appearing in the spectral function A(k,ω), the momentum distribution function n(k) and the Fermi surface are analyzed for various values of the filling (from overdoped to underdoped region) in the intermediate coupling regime at low temperatures. For low doping, in contrast with the ordinary Fermi-liquid behavior of a weakly-correlated metal found at high doping, we report the opening of a pseudogap and some non-Fermi-liquid features as measured for cuprates superconductors. In addition, we show the presence of kinks in the calculated electronic dispersion in agreement with ARPES data.
5 pages, 5 figures

Keywords

Strongly Correlated Electrons, Superconductivity

Citation

URI

http://salesiana.dossiersoluciones.com/handle/123456789/132039

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0607701
 http://arxiv.org/abs/cond-mat/0607701
 Phys. Rev. B 75, 134518 (2007)
 doi:10.1103/PhysRevB.75.134518

Collections

arXiv