Is it weird for graphene, the group velocity and momentum

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PRB147
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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.
 
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PRB147 said:
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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