Indeed, forces are not implemented for hybrid functionals. Also not for
SOC. So, no relaxation of atomic positions is possible.

On Thu, 24 Dec 2015, kadda AMARA wrote:

so much the better it is very cold here !!!
(correct me if I am wrong)
relaxation of atomic positions is possible only for functionals for which the 
forces are calculated correctly (GGA, GGA+U, onsite hybrids). This is not the 
case with spin-orbit coupling
or the full hybrid functionals.

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