Comment on "Calculation of an Enhanced A_{1g} Symmetry Mode Induced by Higgs Oscillations in the Raman Spectrum of High-Temperature Cuprate Superconductors".

@article{Benfatto2022CommentO,
  title={Comment on "Calculation of an Enhanced A\_\{1g\} Symmetry Mode Induced by Higgs Oscillations in the Raman Spectrum of High-Temperature Cuprate Superconductors".},
  author={Lara Benfatto and C. Castellani and Tommaso Cea},
  journal={Physical review letters},
  year={2022},
  volume={129 19},
  pages={
          199701
        }
}
In a recent Letter [1] Puviani et al. claim that the Higgs mode gives an enhancement of the Raman response in the symmetric A1g Raman channel. Here we report technical mistakes which invalidate this conclusion. The Raman susceptibility is the response function for the Raman density operator ρR = ∑ k γkc † kck, where the combination of incident/scattered light enters in each Raman form factor γk (Ref. [2]). The authors of Ref. [1] consider a model H = H0 + HP + HC , where H0 is the non… 
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