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Hi, Folks!

I am going to use finite displacement (sometimes called finite difference if I am right) to calculate phonon of my crystal. As I read from some articles and online forums, we should build a supercell first, then move one atom each atom by a given distance. I have two questions concerning supercell.

1)How could I know how large supercell (2*2*2 or 3*3*3 or even larger) I need to build to satisfy the phonon calculation?

2)What's more, should I also increase k-points correspondingly? For example, if I use 4*3*3 for unit cell, then I need to increase to 32*24*24 in case of 2*2*2 supercell.