Hi
It seems that if we look to Si lattice as an SC with 8 atoms per cell, the
symmetries connected to the fractional translations will not be accepted, so if
we use this scheme to obtain the zone-center phonons of Si, we will get
frequencies rather different from the main one(FCC scheme), with different
symmetries and degenerecies.
How is it possible to obtain the right ones (zone-center phonons) of Si, with
the right symmetries and degenerecies, by the SC scheme?
Thanx
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