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Density of States

The number of available energy states per unit energy interval, a key parameter in determining material properties and electronic behavior.

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The statement of the theorem

The density of states

g(E)

for a system with periodic boundary conditions in a volume

V

is defined by the summation over the Brillouin zone

\Omega_B

\mathbf{k}

-space:\n

g(E) = \frac{V}{(2\pi)^3} \sum_{\mathbf{k}} \delta(E - E_{\mathbf{k}})

Source: Wikipedia