[Pw_forum] irreducible representations

xirainbow nkxirainbow at gmail.com
Sun Jun 20 14:49:55 CEST 2010


Dear eli:
"*E*" means it is a double-degenerate mode.
"*u*" means it is antisymmetry under inversion operation.
You will find more information in books about "lattice dynamics"

On Sun, Jun 20, 2010 at 8:33 PM, eli <elahe_afrodit at yahoo.com> wrote:

> dear all
> in phonon calculation in  output of ph.x, what is irreducible
> representations? "for example 2 modes -E-2u"
> Elahe Teimouri
> Computational Condensed Matter Research Lab
> Physics Department, Isfahan University of Technology, Isfahan, Iran
>
>
____________________________________
Hui Wang
School of physics, Nankai University, Tianjin, China
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