IVDW

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IVDW = 0 | 1 | 10 | 11 | 12 | 2 | 20 | 21 | 202 | 4
Default: IVDW = 0 

Description: IVDW specifies a vdW correction.


The semilocal and hybrid exchange-correlation functionals are unable to describe properly vdW interactions resulting from dynamical correlations between fluctuating charge distributions (called London dispersion forces). A pragmatic way to work around this problem is to add a correction to the conventional Kohn-Sham DFT energy :

The correction term is computed using some of the available approximate methods. The choice of vdW method is controlled via the following tags:

All methods listed above add vdW correction to potential energy, interatomic forces, as well as stress tensor and hence simulations such as atomic and lattice relaxations, molecular dynamics, and vibrational analysis (via finite differences) can be performed. Note, however, that these correction schemes are currently not available for calculations based on density functional perturbation theory.

N.B.: The parameter LVDW used in previous versions of VASP (5.2.11 and later) to activate DFT-D2 method is now obsolete. If LVDW=.TRUE. is defined, IVDW is automatically set to 1 (unless IVDW is specified in INCAR).

Related tags and articles

LVDW, DFT-D2, DFT-D3, Tkatchenko-Scheffler method, Tkatchenko-Scheffler method with iterative Hirshfeld partitioning, Many-body dispersion energy, dDsC dispersion correction

See also the alternative vdW-DF functionals: LUSE_VDW, Nonlocal vdW-DF functionals.

Examples that use this tag