Landau level spectroscopy of electron-electron interactions in graphene

Abstract

We present magneto-Raman scattering studies of electronic inter Landau level excitations in quasi-neutral graphene samples with different strengths of Coulomb interaction. The band velocity associated with these excitations is found to depend on the dielectric environment, on the index of Landau level involved, and to vary as a function of the magnetic field. This contradicts the single-particle picture of non-interacting massless Dirac electrons, but is accounted for by theory when the effect of electron-electron interaction is taken into account. Raman active, zero-momentum inter Landau level excitations in graphene are sensitive to electron-electron interactions due to the non-applicability of the Kohn theorem in this system, with a clearly non-parabolic dispersion relation.

5+2 pages, 2 figures

References in corpus (16)

• The Raman Fingerprint of Graphene
• Ultrahigh electron mobility in suspended graphene
• Boron nitride substrates for high-quality graphene electronics
• Approaching the Dirac point in high mobility multi-layer epitaxial graphene
• Landau level spectroscopy of ultrathin graphite layers
• Infrared spectroscopy of Landau levels in graphene
• Probing the Intrinsic Properties of Exfoliated Graphene: Raman Spectroscopy of Free-Standing Monolayers
• Colloquium: Graphene spectroscopy
• How perfect can graphene be?
• Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures
• Dirac electronic states in graphene systems: Optical spectroscopy studies
• Excitations from Filled Landau Levels in Graphene
• Why does graphene behave as a weakly interacting system?
• Magnetoplasmons excitations in graphene for filling factors $\nu \le 6$
• Probing electronic excitations in mono- to pentalayer graphene by micro-magneto-Raman spectroscopy
• A micro-magneto-Raman scattering study of graphene on a bulk graphite substrate

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• Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures
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• Hubbard Model on the Honeycomb Lattice with an Indefinite Long-Range Interaction