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[Manuel Pérez Jigato <Manuel.PerezJigato@fys.kuleuven.be>]

Dear all

i would like to ask whether the photoelasticity tensor is implemented  
within DFPT.
There is a paper by F Detraux and X Gonze (PRB 63 (2001) 115118)  
"Photoelasticity of alpha-quartz from first principles, but they seem  
to compute from DFPT the dielectric tensor at different strains, and  
then use finite differences.

In Veithen et al (PRB 71 (2005) 125107) they talk about the  
elasto-optic tensor
from DFPT. That seems to be the same thing that the photoelasticity tensor.
Could you please confirm?

and finally, is it available for PAW and LDA+U? (just to avoid the  
finite difference + scissor operator approach)

regards

Manuel Perez Jigato
KU Leuven

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