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Phonon dispersion with VASP

Posted: Tue May 04, 2021 6:00 am
by skm
Can we calculate and draw Phonon spectrum/dispersion of a 2D material with VASP alone, without using Phonopy? Because i am always getting negative frequency for a material, but for the same material the correct (or no negative frequency) phonon spectrum is obtained using Quantum Espresso.