NGZF

NGZF = [integer]
Default: NGZF = set in accordance with PREC, NGZ, ENCUT and ENAUG 

Description: NGZF sets the number of grid points in the "fine" FFT-grid along the first lattice vector.

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On this "fine" FFT mesh the localized augmentation charges are represented if ultrasoft pseudopotentials (USPPs) or the PAW method are used. In case USPPs are used, the local potentials (exchange-correlation, Hartree-potential and ionic potentials) are also calculated on this "fine" FFT-mesh.

By default NGZF is set in accordance with the requested "precision"-mode (PREC), NGZ, and the plane wave kinetic energy cutoffs ENCUT and ENAUG:

PREC	NGZ	NGZF
Normal	3/2×Gcut	2×NGZ
Single	3/2×Gcut	NGZ
Accurate	2×Gcut	2×NGZ
Low	3/2×Gcut	3×Gaug
Medium	3/2×Gcut	4×Gaug
High	2×Gcut	16/3×Gaug

where

$E_{\rm {cut}}={\frac {\hbar ^{2}}{2m_{e}}}G_{\rm {cut}}^{2}\qquad E_{\rm {aug}}={\frac {\hbar ^{2}}{2m_{e}}}G_{\rm {aug}}^{2}$

with E_cut=ENCUT and E_aug=ENAUG.

Alternatively NGZF may be set to a specific value in the INCAR file.

Related Tags and Sections

NGX, NGY, NGZ, NGXF, NGYF, PREC, ENCUT, ENAUG, ENMAX

Examples that use this tag

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