Usually the effect does not consist of a rigid shift and in fact, mBJ
does not seem that good for effective masses as shwon in these articles:

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.82.205212
http://iopscience.iop.org/0953-8984/24/20/205503/
http://scitation.aip.org/content/aip/journal/jap/114/18/10.1063/1.4829674


On Fri, 30 May 2014, Luis Ogando wrote:

Dear Tran,
   Thank you for your comment.
   I am interested in extracting kp parameters (effective masses, ...) from
the calculated band structure. Do you believe that the bands can be
significantly deformed in theses results or the main effect should be a
rigid displacement of the bands ?
   All the best,
                    Luis


2014-05-30 13:45 GMT-03:00 <t...@theochem.tuwien.ac.at>:
      Maybe hybrid functionals, but the problem is that at the moment
      SOC can not be used with hybrid functionals.

      On Fri, 30 May 2014, Luis Ogando wrote:

            Dear Wien2k community,
               I have successfully optimized GaN in the zinc
            blend phase using LSDA.
            After that, I got the band structure using LSDA and
            mBJ (P-semiconductor
            parameters : A=0.267, B=0.656 and e=1).
               I noticed that mBJ significantly improves the
            band gap, but the SO
            splitting goes down from 12meV (LSDA) to 3 meV
            (mBJ). The experimental value
            is about 16 meV.
               Well, I would like to know if there is some way
            to keep both quantities
            well described.
               All the best,
                            Luis



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