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Which outcome occurs when the potential energy periodicity is weakly perturbed?

A)Miniband formation in the band structure
B)Complete suppression of Bloch oscillations
C)Drude model becomes completely accurate
D)Umklapp scattering becomes practically forbidden

💡 Explanation

Miniband formation occurs due to weak perturbations introducing new periodicities (superlattices; weak additional periodic potentials): Bloch's theorem causes band structure distortions. Therefore, minibands form rather than complete suppression or increased validity of Drude models, because potential energy periodicity is perturbed not eliminated.

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