[Pw_forum] atomic displacement when calculating phonon freq

[Serge Nakhmanson]

It means that for doubly and triply degenerate modes any orthogonal
combination of eigenvectors will do. If you want them to be aligned
with particular directions, it falls on you to do the job.

S.

Prasenjit Ghosh wrote:
> Dear Lorenzo,
>> Keep in
>> mind that if 2 modes are degenerate the code's choice of eigenvector is
>> not necessarily the most human-friendly one.
>>
> 
> What do you mean by that?
> 
> Prasenjit
> 
> 


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