Hi,
Sorry, I have no idea what the SO splitting of those previous
calculations has been.
In order to get an estimate, compare the partial charges of those
splitted states. If there is a slight change in hybridization with
slightly modified s,p,d character of the two atoms, it may explain the
modified SO splitting.
I'm also not sure at all if the character of the bands using mBJ is
better than in PBE, in fact I doubt it a little bit.
Eventually you could play with correlation, i.e. couple mBJ exchange
with PBE correlation instead of LDA.
Am 05.02.2015 um 21:46 schrieb Martin Gmitra:
Dear Wien2k developers,
We are observing underestimating trend of spin-orbit coupling
splittings of Gamma_{15} bands in zinc-blende semiconductors.
For instance in GaAs, the Gamma_{15v} splits to Gamma_{8v} and
Gamma_{7v} by the values of about 0.29 eV, while experiment gives 0.34
eV. PBE calculations gives 0.32 eV. Similar one sees for Gamma_{15c}
which splits due to spin-orbit to Gamma_{8c} and Gamma_{7c} where mBJ
gives 0.156 eV and PBE 0.181 eV. This one can compare to 0.174 eV from
GW+SOC calculations [PRL 96, 086405].
In PRB 82, 205212 you present two implementations of mBJ, within
Wien2k and VASP. Could you please provide information whether both the
implementations provide the same spin-orbit splittings of Gamma_{15}
states?
In case they are the same, which part of the Becke-Johnson approach
can be responsible for such a reduction?
Best regards,
Martin Gmitra
Uni Regensburg
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