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Paper detail

Doping Evolution of Oxygen K-edge X-ray Absorption Spectra in Cuprate Superconductors

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.

preprint2013arXivOpen access
C. -C. ChenM. SentefY. F. KungC. J. JiaR. ThomaleB. MoritzA. P. KampfT. P. Devereaux
cond-mat.supr-concond-mat.str-el
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C. -C. ChenM. SentefY. F. KungC. J. JiaR. ThomaleB. MoritzA. P. KampfT. P. Devereaux

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