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On the other hand when a0 increases sufficiently

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Unformatted text preview: till be empty and the conduction band full, since there will be no change in the number of states in each band. On the other hand, when a0, increases sufficiently to close the energy gap, then silicon will be a metal. For further increases to where the gap again opens, it will remain a metal as there will be 2N electrons in the upper band, which do not fill the allowed states. 3.7 Using equation (3.24), show that dE/dk = 0 at...
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