Si example with 'SYMMETRY = .FALSE.'. Normally disabling symmetry is not useful. So the reason this setting exists is for the test, which whould depend on each detailed reason.

Usage:

A set of supercells with displacements and its disp.yaml are created by

% phonopy --dim="2 2 2" -d --nosym

There are 12 displacements, which means 6 directions for each atom in the input unit cell. FORCE_SETS is created by

% phonopy -f vasprun_xmls/disp-{001..012}/vasprun.xml

Phonopy should be run with 'SYMMETRY = .FALSE.' or '--nosym'. 

% phonopy mesh.conf 

The result of the phonopy calculation may be compared with the example found in Si directory.
