Momentum and doping dependence of the electron spectrum and ($π$,0) feature in copper oxide materials

Abstract

The momentum and doping dependence of the electron spectrum of copper oxide materials in the underdoped regime is studied within the t-J model. It is shown that the pseudogap opens near ($π$,0) point in the Brillouin zone, and the electron dispersion exhibits the flat band around ($π$,0), which are consistent with the experiments.

5 pages, Latex, two figures are included, accepted for publication in the Proceedings of International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors VI