[Pw_forum] phonon dispersion curve

zahra sadat naghavi szs_naghavi at yahoo.com
Sat Dec 22 09:06:30 CET 2007

dear anybody!
  with zonefolding approximation there must be 6*(n+1)  branches in phonon dispersion curve for achiral  nanotubes , for (6,6)  it becomes 42, but i found  45 frequencies at G.
  what is the wrong?

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