Dirac cones reshaped by interaction effects in suspended graphene

Abstract

We report measurements of the cyclotron mass in graphene for carrier concentrations n varying over three orders of magnitude. In contrast to the single-particle picture, the real spectrum of graphene is profoundly nonlinear so that the Fermi velocity describing the spectral slope reaches ~3x10^6 m/s at n <10^10 cm^-2, three times the value commonly used for graphene. The observed changes are attributed to electron-electron interaction that renormalizes the Dirac spectrum because of weak screening. Our experiments also put an upper limit of ~0.1 meV on the possible gap in graphene.

References in corpus (11)

• Ultrahigh electron mobility in suspended graphene
• Boron nitride substrates for high-quality graphene electronics
• Suspended Graphene: a bridge to the Dirac point
• Limits on electron quality in suspended graphene due to flexural phonons
• Is graphene in vacuum an insulator?
• Giant Nonlocality near the Dirac Point in Graphene
• Chirality and Correlations in Graphene
• Graphene via large N I: Renormalization
• Quantized Landau level spectrum and its density dependence
• Density dependent exchange contribution to $\partial \mu /\partial n$ in extrinsic graphene
• Electron-Electron Interactions in the Vacuum Polarization of Graphene

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