# Why is the spinor wave function of graphene what it is?

Why is the spinor wave function of graphene $[e^{-i\theta/2}, e^{i\theta/2}]$? Could it be $[e^{-i\theta/}, 1]$?

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Note that both quantum states are equal up to a global phase factor which has no physical meaning. – DaniH Nov 7 '12 at 18:56