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We report on absolute magneto-transmission experiments on highly-dopedquasi-free-standing epitaxial graphene targeting the classical-to-quantumcrossover of the cyclotron resonance. This study allows us to directly extractthe carrier density and also other relevant quantities such as thequasiparticle velocity and the Drude weight, which is precisely measured fromthe strength of the cyclotron resonance. We find that the Drude weight isrenormalized with respect to its non-interacting (orrandom-phase-approximation) value and that the renormalization is tied to thequasiparticle velocity enhancement. This finding is in agreement with recenttheoretical predictions, which attribute the renormalization of the Drudeweight in graphene to the interplay between broken Galilean invariance andelectron-electron interactions.

Classical to quantum crossover of the cyclotron resonance in graphene: A study of the strength of intraband absorption