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

Abstract

We report on absolute magneto-transmission experiments on highly-doped quasi-free-standing epitaxial graphene targeting the classical-to-quantum crossover of the cyclotron resonance. This study allows us to directly extract the carrier density and also other relevant quantities such as the quasiparticle velocity and the Drude weight, which is precisely measured from the strength of the cyclotron resonance. We find that the Drude weight is renormalized with respect to its non-interacting (or random-phase-approximation) value and that the renormalization is tied to the quasiparticle velocity enhancement. This finding is in agreement with recent theoretical predictions, which attribute the renormalization of the Drude weight in graphene to the interplay between broken Galilean invariance and electron-electron interactions.

arXiv comment12 pages, 4 figures

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• Universal Faraday rotation in HgTe wells with critical thickness
• Circular dichroism of magneto-phonon resonance in doped graphene
• Faraday rotation due to surface states in the topological insulator (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$
• Electrical plasmon detection in graphene waveguides
• Magneto-optical probe of the fully gapped Dirac band in ZrSiS
• Edge magnetoplasmons in graphene: Effects of gate screening and dissipation
• Acoustomagnetoelectric effect in two-dimensional materials: Geometric resonances and Weiss oscillations
• Theory of interaction-induced renormalization of Drude weight and plasmon frequency in chiral multilayer graphene
• Gate tunable terahertz cyclotron emission from two-dimensional Dirac fermions
• Linear scaling relation between two-dimensional massless Dirac fermion Fermi velocity and Fe-As bond length in iron arsenide superconductor systems
• Landau level spectroscopy in current solid state physics