Bloch's theorem states that the wave functions for electrons in a periodic potential have the form:(adsbygoogle = window.adsbygoogle || []).push({});

ψ_{n,k}(r) = u_{n}(r)exp(ik⋅r)

, where u_{n}has the same periodicity as the potential.

Bloch's theorem is used to calculate energy bands, and my question is:

Does the n in u_{n}label the different bands of the crystal?

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# I Blochs theorem

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