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Is it weird for graphene, the group velocity and momentum

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  1. Dec 11, 2012 #1
    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.
     
  2. jcsd
  3. Dec 11, 2012 #2

    DrDu

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    Science Advisor

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