Comment on 'The role of electron-electron interactions in two-dimensional Dirac fermions'

Tang et al. [Science 361, 570 (2018)] report on the properties of Dirac fermions with both on-site and Coulomb interactions. The substantial decrease up to ~40% of the Fermi velocity of Dirac fermions with on-site interaction is inconsistent with the numerical data near the Gross-Neveu quantum critical point. This results from an inappropriate finite-size extrapolation.
Comment: Submitted: October 24, 2018, Accepted: November 4, 2019