Extended Data Fig. 4: Determination of ACNP and background subtraction for the absorption spectra.
From: Observation of hydrodynamic plasmons and energy waves in graphene
a, The measured spectrum (solid curve) is fitted to a two-Lorentzian model, in which L1 and L2 represent the fitted absorption spectra at the charge-neutrality point and VG, respectively. b, The global background absorption spectra obtained by averaging the fitted ACNP over a broad range of gate voltages from 0.1 V to 0.8 V. c, Measured \({{A}_{{V}_{{\rm{G}}}}-A}_{{\rm{CNP}}}\) at various gate voltages. d, \({A}_{{V}_{{\rm{G}}}}\) obtained by subtracting the global absorption background associated with ACNP.
