Reciprocal Space and Brillouin Zones in Two and Three ...
The two-dimensional square lattice is even simpler. The two lattice vectors a and b are equal in length and separated by a 90˚ angle. The reciprocal lattice basis vectors a* and b* are respectively perpendicular to a and b, and obviously make a 90˚ angle to each other. The reciprocal lattice points generated by these basis vectors is also
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