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What gives graphene a valley degeneracy of gv=2?

What gives graphene a valley degeneracy of gv=2? Correct Answer Sets labeled as K and K’

In an ideal planar graphene sample, without defects, the conduction and valence bands meet at Dirac points. These points are six locations in momentum space which are divided into two non-equivalent sets of three points each. The sets are labeled as K and K’. These sets provide graphene a valley degeneracy of gv=2.

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