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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