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Two different points of view are available to understand the behavior ofgraphene at low energies. One is considering a large $N_F$ that makes graphenea semimetal, and another for small $N_F < 2.5$ that would make graphene anarrow gap semiconductor (D. T. Son, Phys. rev. B 75, 235423 (2007)), aprediction supported independently by Monte Carlo simulations (J. E. Drut andT. A. L\"ahde, Phys. Rev. Lett. 102, 026802 (2009), see also Phys. Rev. B 79,241405(R) (2009)). Taking into account recently obtained experimental evidencefor weakly coupled graphene layers, i.e. graphite (N. Garc\'ia et al.,arXiv/1106.0437), we tend to support the last one.

Comment on "Dirac cones reshaped by interaction effects in suspended graphene" by Elias et al., Nature Physics 7, 701 (2011)