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Old May 21st 2009, 10:31 AM   #1
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Join Date: May 2009
Posts: 3
band gap in metals and insulators

I have a new q,perhaps it may solve the problem,
suppose the electronic sturcture of a solid that represents a two dimensional square lattice of divalent atoms can be discribed using nearly free electron model with a weak potential such that U<<h^2/4M(Pi^2)*(Pi/a)^2
*=multiply
^2=square
where a=lattice parameter
is this solid a metal, an insulator or a semi conductor? why?
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