%0 Journal Article
%T Doping Evolution of Oxygen K-edge X-ray Absorption Spectra in Cuprate Superconductors
%A C. -C. Chen
%A M. Sentef
%A Y. F. Kung
%A C. J. Jia
%A R. Thomale
%A B. Moritz
%A A. P. Kampf
%A T. P. Devereaux
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevB.87.165144
%X We study oxygen K-edge x-ray absorption spectroscopy (XAS) and investigate the validity of the Zhang-Rice singlet (ZRS) picture in overdoped cuprate superconductors. Using large-scale exact diagonalization of the three-orbital Hubbard model, we observe the effect of strong correlations manifesting in a dynamical spectral weight transfer from the upper Hubbard band to the ZRS band. The quantitative agreement between theory and experiment highlights an additional spectral weight reshuffling due to core-hole interaction. Our results confirm the important correlated nature of the cuprates and elucidate the changing orbital character of the low-energy quasi-particles, but also demonstrate the continued relevance of the ZRS even in the overdoped region.
%U http://arxiv.org/abs/1211.2813v2