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Hi<BR>
Thanx for your answer, besides i want to ask you one more thing! <BR>
<BR>
>> If you do things properly, you will get the modes you<BR>should get, with or without symmetry imposed, apart from<BR>minor losses of symmetry due to incomplete convergence<BR>
<BR>
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?<BR>
thanx again<BR>
<BR>
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