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Electronic band structure
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==== Asymmetry: Band structures in non-crystalline solids ==== Although electronic band structures are usually associated with [[crystal]]line materials, [[quasi-crystal]]line and [[amorphous solid]]s may also exhibit band gaps. These are somewhat more difficult to study theoretically since they lack the simple symmetry of a crystal, and it is not usually possible to determine a precise dispersion relation. As a result, virtually all of the existing theoretical work on the electronic band structure of solids has focused on crystalline materials.
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