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{{short description|
{{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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