[Phonopy-users] Force constant unit

[Mohammad K. <mkh...@gm...>]

Hi everyone,

What is the unit of force constants in
FORCE_CONSTANTS file of phonopy?

Is it N/m or eV/Ang^2 or .... ?

In VASP the unit of force is eV/Ang and
the unit of distance is Ang. Therefore,
I guess the unit of force constant should be eV/Ang^2.

Am I right?


I appreciate your kind reply.

Best regards,
Mohammad