[QE-users] Born Huang and Huang invariance conditions

[Elio Physics]

Dear all,

There have been several papers discussing the use of the so-called Born-Huang and Huang invariance conditions to soothe the possible negative frequencies that may arise in the long wavelength limit (q->0, near the G point) in the phonon dispersion of 2D and 1D material.

Is there a specific flag in the ph.x input file that needs to be turned on to incorporate such corrections?

Regards

Elie Moujaes
Adjunct professor level 4
Federal University of Rondonia
Brazil
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