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Is there any equation which describes the behavior of the crystal momentum under the action of an externally applied electric field?

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  • $\begingroup$ How would the crystal momentum (and you had better be careful about just what you mean by that) couple to an external electric field? $\endgroup$ – Jon Custer Sep 14 '17 at 12:56
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Well, absent anything else, Bloch oscillations https://en.wikipedia.org/wiki/Bloch_oscillations.

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