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{{short description|Theoretical electronic band structure model in which the potential is periodic and weak}}
{{Electronic structure methods}}
The '''empty lattice approximation''' is a theoretical [[electronic band structure]] model in which the potential is ''periodic'' and ''weak'' (close to constant). One may also consider an empty{{clarify|is there actually some lattice that is "empty"?|date=November 2014}} irregular lattice, in which the potential is not even periodic.<ref>Physics Lecture Notes. P.Dirac, Feynman, R.,1968. Internet, Amazon,25.03.2014.</ref> The empty lattice approximation describes a number of properties of energy dispersion relations of non-interacting [[Free electron model|free electrons]] that move through a [[crystal structure|crystal lattice]]. The energy of the electrons in the "empty lattice" is the same as the energy of free electrons. The model is useful because it clearly illustrates a number of the sometimes very complex features of energy dispersion relations in solids which are fundamental to all electronic band structures.
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==External links==
*[http://www2.sjsu.edu/faculty/watkins/brillouin.htm Brillouin Zone simple lattice diagrams by Thayer Watkins] {{Webarchive|url=https://web.archive.org/web/20060914142130/http://www2.sjsu.edu/faculty/watkins/brillouin.htm |date=2006-09-14 }}
*[http://phycomp.technion.ac.il/~nika/brillouin_zones.html Brillouin Zone 3d lattice diagrams by Technion.] {{Webarchive|url=https://web.archive.org/web/20061205220050/http://phycomp.technion.ac.il/~nika/brillouin_zones.html |date=2006-12-05 }}
*[http://www.doitpoms.ac.uk/tlplib/brillouin_zones/index.php DoITPoMS Teaching and Learning Package- "Brillouin Zones"]
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