[Pw_forum] About the flattening of phonon branches

Reza Ebraahimi rezaebraahimi at yahoo.com
Thu Jun 17 08:52:38 CEST 2010

I mean, for example in the case of ALAs (P. Giannozzi et al PRB 43, 7231 (1991)), the LO mode in the Gamma-X direction is very flat (mentioned by the authors, too). 
Is it related to the long interaction caused by the band structure (Sokel & Harrison PRL 36, 61)?
Sorry about the affiliation
Thank You

R. Ebraahimi
Graduate Student- Tehran University

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