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I was trying to plot the phonon dispersion (DFPT methpod) for a single 1D chain of Carbon atoms (2 atoms per unit cell) and I found something different.

Different values of k vector are giving the same frequency value (See attached file named 'gnu'). So the dispersion curve looks like a straight line parallel to k axis (See attached file named 'phonon_dispersion'). Is there anything wrong with my INPUT files? Please find attached the files. (run.sh is the script used to run the calculation)

Explanations are provided here:
Phonons_from_density-functional-perturbation_theory
Computing_the_phonon_dispersion
You need LPHON_DISPERSION and QPOINTS.

I tried that also. But still I am getting straight lines in the dispersion curve

Can you upload all files (.zip) of this calculation?

'gnu' is the output file which contains the phonon frequencies and 'phonon' is the plot made using that. 'run.sh' is the script used to do DFPT calculation