Figure 1

(a) Simulated real part of self-energy $\mathrm{Re}\Sigma$ at different energy resolutions. Four modes at 25, 40, 60, and 80 meV are assumed in ${\alpha }^{2}F(\omega )$ and an impurity term 100 meV is added in the imaginary part of self-energy. The inset shows the measured $\mathrm{Re}\Sigma$ for LSCO $x=0.03$ (solid squares), our fitted curve (red line) and Valla’s simulated curve at 18 meV energy resolution (blue line). (b) Second derivative of the simulated $\mathrm{Re}\Sigma$ at different energy resolutions. The inset shows a Lorentzian (black) and its second derivative (red).Reuse & Permissions