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KPOINT_BSE

The flag `KPOINT_BSE` allows to calculate the dielectric matrix
at one of the points used to sample the Brillouine zone.
In the simplest form one can specify

KPOINT_BSE= index_of_k-point

It is best to select the desired k-point
from the list of k-points in the OUTCAR file. Additionally a shift by an arbitrary reciprocal lattice
vector can be supplied by specifying three additional integer numbers:
KPOINT_BSE = index_of_k-point n1 n2 n3

This allows the calculate the dielectric function at a
k-point outside the first Brillouine zone corresponding to

where are the reciprocal lattice vectors of
the unit cell.

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