Dirac cones reshaped by interaction effects in suspended graphene

Details Dirac cones reshaped by interaction effects in suspended graphene Dirac cones reshaped by interaction effects in suspended graphene

2011-04-07

arxiv.org/abs/1104.1396v2

Nature Phys. 7, 701-704 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1038/nphys2049

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.

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