Is it weird for graphene, the group velocity and momentum

PRB147

everyone knows, there exists the relation between the group velocity and energy dispersion.
a question is how to expression the relation between the velocity and momentum k?
it seems that the Dirac electron in graphene is massless.

DrDu

Quote by PRB147

it seems that the Dirac electron in graphene is massless.

Yes, the effective mass is zero. That's one of the reasons for the hpye about graphene.

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PRB147	Is it weird for graphene, the group velocity and momentum Tweet everyone knows, there exists the relation between the group velocity and energy dispersion. a question is how to expression the relation between the velocity and momentum k? it seems that the Dirac electron in graphene is massless.