ALDAC: Difference between revisions
No edit summary |
No edit summary |
||
| Line 9: | Line 9: | ||
The amount of gradient correction to the exchange and the correlation contributions can be set indepently, however (some [[list_of_hybrid_functionals|popular hybride functionals]] for instance use only 0.8 of the gradient contribition to the exchange). The GGA flags {{TAG|AGGAX}} and {{TAG|AGGAC}} are only used if GGA is already selected (for LDA type calculations no gradient correction will be added regardless of values is used for {{TAG|AGGAX}} and {{TAG|AGGAC}}). | The amount of gradient correction to the exchange and the correlation contributions can be set indepently, however (some [[list_of_hybrid_functionals|popular hybride functionals]] for instance use only 0.8 of the gradient contribition to the exchange). The GGA flags {{TAG|AGGAX}} and {{TAG|AGGAC}} are only used if GGA is already selected (for LDA type calculations no gradient correction will be added regardless of values is used for {{TAG|AGGAX}} and {{TAG|AGGAC}}). | ||
== Related | == Related tags and articles == | ||
{{TAG|AEXX}}, | {{TAG|AEXX}}, | ||
{{TAG|AGGAX}}, | {{TAG|AGGAX}}, | ||
| Line 20: | Line 20: | ||
---- | ---- | ||
[[Category:INCAR]][[Category:Exchange-correlation functionals]][[Category:Hybrid_functionals]] | [[Category:INCAR tag]][[Category:Exchange-correlation functionals]][[Category:Hybrid_functionals]] | ||
Revision as of 14:06, 8 April 2022
ALDAC = [real]
Default: ALDAC = 1.0
Description: ALDAC specifies the fraction of LDA correlation in a Hartree-Fock/DFT hybrid functional type calculation.
The sum of the fraction of the exact exchange and LDA exchange is always 1.0, and it is not possible to set the amount of LDA exchange independently. Examples: if AEXX=0.25, 1/4 of the exact exchange is used, and 3/4 of the LDA exchange is added. For AEXX=0.5, half of the exact exchange is used, and one half of the LDA exchange is added.
The amount of LDA correlation included in the hybrid functional can be specified through the ALDAC-tag.
The amount of gradient correction to the exchange and the correlation contributions can be set indepently, however (some popular hybride functionals for instance use only 0.8 of the gradient contribition to the exchange). The GGA flags AGGAX and AGGAC are only used if GGA is already selected (for LDA type calculations no gradient correction will be added regardless of values is used for AGGAX and AGGAC).
Related tags and articles
AEXX, AGGAX, AGGAC, LHFCALC, settings for specific hybrid functionals