[Pw_forum] generalized eigen values

[Stefano de Gironcoli]

plane waves form an orthonormal basis set.

whether this defines a generalized eigenvalue problem or not depends on 
what you use planewaves for.
If they expand the full vawefunction (as in norm-conserving PP) you have 
a normal eigenvalue problem ,
if you expand the pseudo part of a wfc that needs to be augmented to 
reconstruct the charge density (USPP or PAW) a generalized eigenvalue 
problem results.

stefano

On 10/03/2012 01:00 PM, Padmaja Patnaik wrote:
> Hi All
>
> I have a query. Anybody please can explain this.If you use the plane wave basis, will you have generalized  eigenvalue problem?
>
>   
> Padmaja Patnaik
> Research Scholar
> Dept of Physics
> IIT Bombay
> Mumbai, India
>
>
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