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Energy bandstructures of unstrained and strained [100] silicon nanowires are calculated with nearest neighbor (NN) sp3d5s* tight binding model. Square nanowires with four {110} bounding facets of various thicknesses are simulated. It is found that bandgaps of nanowires increase with decreasing the wire thickness. Uniaxial strain effects are accounted for by displacing the silicon atoms and modifying...
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