[Pw_forum] irreducible representations

[Stefano Baroni]

See chapter XII of Landau's "Quantum mechanics" or any other textbook of quantum mechanics / molecular physics / condensed matter physics.  If all this takes too much time, google may also help ... Stefano B

On Jun 20, 2010, at 2:33 PM, eli 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
> 
> 
> 
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---
Stefano Baroni - SISSA  &  DEMOCRITOS National Simulation Center - Trieste
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