Noun
Brillouin zone (plural Brillouin zones)
(mathematics, physics) A uniquely defined primitive cell forming part of the reciprocal lattice, involved in calculations regarding waves in a periodic medium given by Bloch's theorem.
To U-process to occur the decaying phonon to have a wave vector q 1 that is roughly half of the diameter of the Brillouin zone, because otherwise quasimomentum would not be conserved. Source: Internet
Since it is time-consuming to calculate the energy for a molecule, it is even more time-consuming to calculate them for the entire list of points in the Brillouin zone. Source: Internet