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In this comment it is pointed out that the electron velocity of the sameorder as observed in graphene had been measured in GaAs submicron devices longago. Particle- antiparticle asymmetry related with electron and hole effectivemasses in graphene seems puzzling as hole in a condensed matter system cannotbe treated as anti-electron. It is argued that there should be a universalelectrodynamics for QHE and superconductivity. In this context attention isdrawn to the new approach based on massless electron and the interpretationthat magnetic field represents angular momentum of the photon fluid.Measurement of electron velocity in graphene and GaAs in parallel is suggestedfor testing the massless electrodynamics.

Comment on "Cyclotron resonance study of the electron and hole velocity in graphene monolayers"