Word Count : 268

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In the tight binding approximation, the energy dispersion for an s-band is given by [ E(\mathbf{k}) = E_0 + \sum_{\mathbf{R}} t(\mathbf{R}) e^{i \mathbf{k} \cdot \mathbf{R}} ] where (E_0) is the on-site energy, (t(\mathbf{R})) is the hopping integral to a neighbour at (\mathbf{R}), and the sum is over all nearest neighbours. For a bcc __________ __________ ______ ___ ______ ________.
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