[Pw_forum] When to use dipole correction?

[Dae Kwang Jun]

Dear all,

In Bengsston's paper from 1999, it is stated that an "asymmetric slab with
a net surface dipole density" requires a dipole correction. My question is
whether the electrostatic potential in the vacuum region is a good marker
on determining whether a dipole correction is needed. From my
understanding, a dipole correction is needed if the electrostatic potential
on the vacuum region is not constant (i.e. the electrostatic potential has
a slope). Similarly, a dipole correction is not needed if the electrostatic
potential on the vacuum region is constant. Is this correct?

Sincerely,

Dae Kwang Jun
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