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.
@article{arxiv.1211.2813,
title = {Doping Evolution of Oxygen K-edge X-ray Absorption Spectra in Cuprate Superconductors},
author = {C. -C. Chen and M. Sentef and Y. F. Kung and C. J. Jia and R. Thomale and B. Moritz and A. P. Kampf and T. P. Devereaux},
journal= {arXiv preprint arXiv:1211.2813},
year = {2013}
}
Comments
Original: 5 pages, 4 figures. Replaced: 6 pages and 4 figures, with updated title and content