Comment on "Measurement of x-ray absorption spectra of overdoped high-temperature cuprate superconductors: Inapplicability of the single-band Hubbard model"

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In a recent Letter, Peets, et al. measured the x-ray intensity at the oxygen K-edge in overdoped La₂₋ₓSrₓCuO₄±δ (LSCO) and Tl₂Ba₂CuO₆₊δ. They claimed that, unlike the underdoped samples of LSCO and YBa₂Cu₃Oₓ in which the integrated intensity increases at least linearly with doping, it saturates abruptly for a hole count exceeding x≈ 0.23. They interpreted the saturation as a breakdown of the 1-band Hubbard model in the cuprates. However, we show that their results are in quantitative agreement with the 1-band Hubbard model.