Question

How to determine the direction of the wave with the wave vector at Gamma point in the Brillouin zone center?

Answer 1

In the Brillouin zone, such as M point in the Brillouin zone of hexagon lattice, we can determine the direction of this wave vector in the real space; however, for Gamma point,I can't determine the direction in the real space.

Answer 2

Rohit P. Prasankumar, Antoinette J. Taylor · 2016 · Science

(c) The first Brillouin zone of an f.c.c. crystal, with the points of high symmetry labeled. ... of high symmetry in the reciprocal lattice correspond to wave vectors that define the ...