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The Mott criterion describes the critical point of the metal–insulator transition. The criterion is
n − 1 / 3 < C a 0 ∗ , {\displaystyle n^{-1/3} where n {\displaystyle ~n} is the electron density of the material and a 0 ∗ {\displaystyle a_{0}^{*}} the effective bohr radius. The constant C {\displaystyle C} , according to various estimates, is 2.0, 2.78,4.0, or 4.2. If the criterion is satisfied the material becomes conductive and otherwise it will be an insulator.
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