crystal momentum


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crystal momentum

[¦krist·əl mə′men·təm]
(solid-state physics)
The product of Planck's constant and the wave vector associated with an elementary excitation in a crystal (the magnitude of the wave vector being taken as the reciprocal of the wavelength).
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Figure 2 shows a density of states projected onto both crystal momentum component k parallel to the edge and the distal row of edge atoms.
In an indirect band gap semiconductor, ibis process can occur only when a third particle, a phonom that conserves tire crystal momentum is involved.