Hi
Thanx for your answer, besides i want to ask you one more thing!
>> If you do things properly, you will get the modes youshould get, with or
>> without symmetry imposed, apart fromminor losses of symmetry due to
>> incomplete convergence
what may cause this incomplete convergence(sorry if it's silly)? and about
increasing the branches of phonon dispersion, using the SC scheme (like the
linear chain described in Ashcrofht & Mermin), how many frequencies will you
get of Si lattice at the experiment finally(the two schemes describe different
# of modes at the Gamma point?
thanx again
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