BEXX: Difference between revisions

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(Created page with "{{TAGDEF|BEXX|[real]}} {{DEF|BEXX|0.25|if {{TAG|LHFCALC}}{{=}}.TRUE. .AND. {{TAG|LRHFCALC}}{{=}}.FALSE.|1|if {{TAG|LRHFCALC}}{{=}}.TRUE.|0|if {{TAG|LHFCALC}}{{=}}.FALSE.}} Description: {{TAG|AEXX}} specifies the fraction of exact exchange in a Hartree-Fock-type/hybrid-functional calculation. ---- {{NB|mind| *For versions of VASP prior to 6.4.0, {{TAG|ALDAX}} was constrained to be equal to 1.0-{{TAG|AEXX}}. This constraint is lifted since VASP.6.4.0. *For {{TAG|AEXX}}{{=...")
 
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Description: {{TAG|AEXX}} specifies the fraction of exact exchange in a Hartree-Fock-type/hybrid-functional calculation.
Description: {{TAG|AEXX}} specifies the fraction of exact exchange in a Hartree-Fock-type/hybrid-functional calculation.
{{Available|6.6.0}}
----
----
{{NB|mind|
*For versions of VASP prior to 6.4.0, {{TAG|ALDAX}} was constrained to be equal to 1.0-{{TAG|AEXX}}. This constraint is lifted since VASP.6.4.0.
*For {{TAG|AEXX}}{{=}}1.0, VASP switches off correlation by default ({{TAG|ALDAC}}{{=}}0.0, {{TAG|AGGAC}}{{=}}0.0, and {{TAG|AMGGAC}}{{=}}0.0) and thus runs a full Hartree-Fock calculation.}}


== Related tags and articles ==
== Related tags and articles ==

Revision as of 09:41, 29 January 2026

BEXX = [real] 

Default: BEXX = 0.25 if LHFCALC=.TRUE. .AND. LRHFCALC=.FALSE.
= 1 if LRHFCALC=.TRUE.
= 0 if LHFCALC=.FALSE.

Description: AEXX specifies the fraction of exact exchange in a Hartree-Fock-type/hybrid-functional calculation.

Mind: Available as of VASP 6.6.0

Related tags and articles

AEXX, ALDAX, ALDAC, AGGAX, AGGAC, AMGGAX, AMGGAC, LHFCALC, HFSCREEN, LRHFCALC, List of hybrid functionals, Hybrid functionals: formalism

Examples that use this tag

References