Question: Prove the formula (1.9.44) for the electron momentum in the case of a band described by the k p approximations (1.9.36) and (1.9.39). ():

Prove the formula (1.9.44) for the electron momentum in the case of a band described by the k · p approximations (1.9.36) and (1.9.39). (): = m FVE, (1.9.44)

(): = m FVE, (1.9.44)

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