Dear Ismail,
You are right the ionic term on the atomic forces was missing.
At the moment the Berry's phase electric field is supposed to work
without using the symmetry of the k-points (option: nosym=.true. ).
With the CVS version the options gdir=1 and gdir=2 should work
also on parallel machin
Dear users,
I've been experimenting with the addition of external electric fields
via the Berry phase method with pw.x --- i.e. the type of electric
field turned on by the input flag "lelfield" in conjunction with flags
"lberry, gdir, nppstr, nberrcyc, efield". After some hiccups
(regardi
