Brillouin zone
Brillouin zone
"Brillouin zone" is defined in the wave number space (reciprocal space) as a region separated by perpendicular bisector planes of reciprocal lattice vectors drawn from the point of origin. Bragg reflections take place on the boundaries of the Brillouin zones, and the incident electron with a constant energy undergoes dispersion in their wave numbers, thus dispersion surfaces are produced. Since the dispersion surfaces exhibit the periodicity of the crystal lattice, the change of wave numbers (dispersion surfaces) due to dynamical diffraction is enough to be calculated only in a Brillouin zone.
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