LVHAR: Difference between revisions

Revision as of 14:13, 6 February 2024

LVHAR = [logical]
Default: LVHAR = .FALSE.

Description: Determines whether the local potential $V_{\text{ionic}}(\mathbf{r}) +V_{\text{hartree}}(\mathbf{r})$ (in eV) is written to the LOCPOT file.

${\displaystyle V_{\text{ionic}}(\mathbf{r})+V_{\text{hartree}}(\mathbf{r}) = V_{\text{ionic}}(\mathbf{r}) + \int \frac{n(\mathbf{r'})}{|\mathbf{r}-\mathbf{r'}|}d\mathbf{r'} }$

where $V_{\text{ionic}}(\mathbf{r})$ is the ionic potential as mimicked by the pseudopotentials and $V_{\text{hartree}}(\mathbf{r})$ is the Hartree potential.

The local potential is written to the LOCPOT file and hence to the same file as the local potential for LVTOT=T. Carefully check that the LOCPOT file contains the potential you expect. WRT_POTENTIAL also gives access to the ionic and Hartree potentials and offers more options.

Warning: Setting LVHAR=True will set LVTOT=False.

See LOCPOT to find out how to write $V_{\text{ionic}}(\mathbf{r}) +V_{\text{hartree}}(\mathbf{r})$ in VASP < 5.2.12.

@@ Line 1: / Line 1: @@
 {{TAGDEF|LVHAR|[logical]|.FALSE.}}
-Description (for VASP.5.2.12 and higher):
+Description: Determines whether the local potential <math>V_{\text{ionic}}(\mathbf{r}) +V_{\text{hartree}}(\mathbf{r}) </math> (in eV) is written to the {{FILE|LOCPOT}} file.
-The potential <math>V_{\text{LOCPOT}}(\mathbf{r})</math> (in eV) written to the [[LOCPOT]] file is
+----
 <math>
-V_{\text{LOCPOT}}(\mathbf{r}) =
+V_{\text{ionic}}(\mathbf{r})+V_{\text{hartree}}(\mathbf{r}) =
-V(\mathbf{r}) +
+V_{\text{ionic}}(\mathbf{r}) +
-\int \frac{n(\mathbf{r'})}{|\mathbf{r}-\mathbf{r'}|}d\mathbf{r'}+
+\int \frac{n(\mathbf{r'})}{|\mathbf{r}-\mathbf{r'}|}d\mathbf{r'}
-V_{\text{XC}}(\mathbf{r})
 </math>
-where <math>V(\mathbf{r})</math> is the ionic potential,
+where <math>V_{\text{ionic}}(\mathbf{r})</math> is the ionic potential as mimicked by the pseudopotentials and <math>V_{\text{hartree}}(\mathbf{r})</math> is the Hartree potential.
-the second term is the Hartree potential and
-<math>V_{\text{XC}}(\mathbf{r})</math> is the exchange-correlation potential.
-If {{TAG|LVHAR}}=.TRUE. is set in the INCAR file, the file [[LOCPOT]] is written without the <math>V_{\text{XC}}(\mathbf{r})</math> contribution being added up.
+The local potential is written to the {{FILE|LOCPOT}} file and hence to the same file as the local potential for {{TAG|LVTOT}}=T. Carefully check that the {{FILE|LOCPOT}} file contains the potential you expect.
-Use {{TAG|LVTOT}}=.TRUE. to include <math>V_{\text{XC}}(\mathbf{r})</math> contribution.
+{{TAG|WRT_POTENTIAL}} also gives access to the ionic and Hartree potentials and offers more options.
+{{NB|warning|Setting {{TAG|LVHAR}}{{=}}True will set {{TAG|LVTOT}}{{=}}False.}}
+See {{TAG|LOCPOT}} to find out how to write <math>V_{\text{ionic}}(\mathbf{r}) +V_{\text{hartree}}(\mathbf{r}) </math> in VASP < 5.2.12.
-----
+== Related tags and articles ==
-<!--
+[[Computing the work function]], {{TAG|LVTOT}}, {{FILE|LOCPOT}}, {{TAG|WRT_POTENTIAL}}, {{TAG|LVACPOTAV}}
-Note that in VASP.5.2.12, the default is to write the entire local potential, including the exchange-correlation potential.
--->
-See [[LOCPOT]] to find out how to not include the <math>V_{\text{XC}}(\mathbf{r})</math> in older versions of VASP.
 {{sc|LVHAR|Examples|Examples that use this tag}}
-----
-[[Category:INCAR tag]][[Category:Electronic minimization]]
+[[Category:INCAR tag]][[Category:Electrostatics]]