Hi
in order to have the Gamma-point phonon frequencies, if we use the SC lattice
schemma for Si, it seems that we have frequencies rather diffrerent from the
FCC schemma. What do you expect of the irreps and the symmetries of the
modes(and also their number) of SC schemma with 8-atom basis comparing to the
FCC one(with 2 atoms per basis)? what should be the same in two shemmas?
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