Extended Data Fig. 11: Characterization of the graphene sample.
From: Extremely efficient terahertz high-harmonic generation in graphene by hot Dirac fermions
a, Raman spectrum of the graphene sample. b, Linear conductivity, real and imaginary, of the graphene film normalized to the universal conductivity σ0 = e2/(4ħ). The symbols represent the experimental data; the solid lines represent the Drude fit with a Fermi level energy EF = 170 meV (corresponding to a doping concentration Nc = 2.1 × 1012 cm−2) and a scattering time τ0 = 47 fs as fitting parameters. The error bars are the standard deviation in the measurements.
