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This is an example of the use of the DFTB+ interface. An input is
given in the dftb_in.hsd file along with the conventional unit cell in
geo.gen. This example also requires the pbc-0-3 Slater-Koster
parameteters for carbon
(https://www.dftb.org/parameters/download/pbc/pbc-0-3-cc/).
1) Create the (one) displaced supercell structure(s):
phonopy -d --dim="4 4 4" --dftb+
2) Run the supercell input with dftb+. This has been pre-calculated
with DFTB+ version 18.2, with the required data stored in the file
results.tag.
3) Collect the forces:
phonopy -f results.tag --dftb+ ...
4) Calculate phonon dispersion data into band.yaml and save band.pdf:
phonopy --dftb+ --dim="4 4 4" -p -s band.conf
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