Chen, C. -C.Sentef, M.Kung, Y. F.Jia, C. J.Thomale, R.Moritz, B.Kampf, A. P.Devereaux, T. P.2013-10-012013-10-012013-10-01201310.1103/PhysRevB.87.165144https://infoscience.epfl.ch/handle/20.500.14299/95473WOS:000318520900008We 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 quasiparticles, but also demonstrate the continued relevance of the ZRS even in the overdoped region.text::journal::journal article::research article