Category:Electrostatics

From VASP Wiki

Computing the properties of charged and dipolar systems requires proper treatment of the electrostatics. Without appropriate corrections, the energies, forces, and potentials will not correspond to the expected boundary conditions. This page provides a summary of the corrections that are implemented and the relevant INCAR tags to activate these corrections. Practical details regarding convergence, setting up, and running relevant calculations can be found in the how-to section.

Summary of relevant INCAR tags

The table contains a summary of INCAR tags for performing monopole, dipole, and quadrupole corrections. Please see the relevant pages of the respective tags for more detailed information. In general, we refer to a 3D system as a system with periodicity in all three dimensions of a cell, a 2D system as having requirements of periodicity only along two out of the three dimensions (eg. a slab or a 2D-material such as graphene), a 1D system as having requirements of periodicity along only one out of the three dimensions (eg. a nano-rod) and a 0D system as having no requirements of periodicity (such as an atom or a molecule).

Dimensionality of the system Does the system have net charge? Does the system have a net dipole moment? Relevant INCAR tags for monopole/dipole corrections
Any No No None
3D Yes No NELECT, LMONO, EPSILON
3D No Yes DIPOL, IDIPOL, EPSILON
3D Yes Yes NELECT, DIPOL, IDIPOL, EPSILON
2D Yes No NELECT
2D No Yes IDIPOL, LDIPOL, DIPOL
2D Yes Yes NELECT
1D Yes No NELECT
1D No Yes Not implemented
1D Yes Yes Not implemented
0D Yes No NELECT, LMONO, LDIPOL
0D No Yes LDIPOL
0D Yes Yes NELECT, LMONO, LDIPOL
Tip: If an external electrostatic field is desired for slab or molecular calculations, see EFIELD.

How to

Practical guides to electrostatic corrections implemented in VASP: