KERNEL TRUNCATION/LTRUNCATE: Difference between revisions

Latest revision as of 09:00, 26 November 2025

KERNEL_TRUNCATION/LTRUNCATE = .True. | .False.
Default: KERNEL_TRUNCATION/LTRUNCATE = .False.

Description: KERNEL_TRUNCATION/LTRUNCATE truncates the coulomb kernel to remove electrostatic interactions along non-periodic dimensions

Setting KERNEL_TRUNCATION/LTRUNCATE = T switches on coulomb kernel truncation methods. These methods removes interactions with periodic replicas in non-periodic directions, i.e. along the surface normal for 2D materials and along all directions for 0D systems such as atoms and molecules.

Mind:

This tag acts as a "super-tag", i.e. unless this tag is switched on further options in KERNEL_TRUNCATION will be ignored.
This tag is only available as of VASP.6.5.0.

Default settings

The following default settings are assumed when setting KERNEL_TRUNCATION/LTRUNCATE = T,

  KERNEL_TRUNCATION {
        LTRUNCATE      = T
        IDIMENSIONALITY = 0
        LCOARSEN       = T
  }

which translates to 0D coulomb truncation which is suitable for a molecule using the coarsen before pad strategy^[1]. Detailed information is available on the respective pages of the INCAR tags.

References

↑ S. Vijay, M. Schlipf, H. Miranda, F. Karsai, M. Kaltak, M. Marsman, G. Kresse, Efficient periodic density functional theory calculations of charged molecules and surfaces using Coulomb kernel truncation, Phys. Rev. B 112, 045409 (2025).

[vijay:prb:2025-1] S. Vijay, M. Schlipf, H. Miranda, F. Karsai, M. Kaltak, M. Marsman, G. Kresse, Efficient periodic density functional theory calculations of charged molecules and surfaces using Coulomb kernel truncation, Phys. Rev. B 112, 045409 (2025).

[1]

@@ Line 4: / Line 4: @@
 ----
 Setting {{TAG|KERNEL_TRUNCATION/LTRUNCATE}} = T  switches on coulomb kernel truncation methods. These methods removes interactions with periodic replicas in non-periodic directions, i.e. along the surface normal for 2D materials and along all directions for 0D systems such as atoms and molecules.
-{{NB|mind|This tag acts as a "super-tag", i.e. unless this tag is switched on further options in KERNEL_TRUNCATION will be ignored.}}
+{{NB|mind|
+*This tag acts as a "super-tag", i.e. unless this tag is switched on further options in KERNEL_TRUNCATION will be ignored.
+*This tag is only available as of VASP.6.5.0.}}
 == Default settings ==
@@ Line 16: / Line 18: @@
     }
-which translates to 0D coulomb truncation which is suitable for a molecule using the coarsen before pad strategy{{cite|vijay:arxiv:2024}}. Detailed information is available on the respective pages of the {{FILE|INCAR}} tags.
+which translates to 0D coulomb truncation which is suitable for a molecule using the coarsen before pad strategy{{cite|vijay:prb:2025}}. Detailed information is available on the respective pages of the {{FILE|INCAR}} tags.
 == Related tags and articles ==