PARAM2
PARAM2 = [real]
Default: PARAM2 = 1.0
Description: for GGA=MK, or for GGA=BO.
The PARAM2 tag determines the value corresponding to different parameters depending on the GGA functional that is chosen:
- in the optB86b[1] ( is not shown in this work since implicitly set to 1.0), B86R[2], and DF3-opt2[3] exchange functionals, which have the same analytical form and correspond to GGA=MK. PARAM2 should in principle be set to 1.0 for the nonlocal optB86b-vdW functional[1], to 0.711357 for the nonlocal rev-vdW-DF2[2] functional, or to for the vdW-DF3-opt2 nonlocal functional[3].
- in the optB88[4] and DF3-opt1[3] exchange functionals, which have the same analytical form and correspond to GGA=BO. PARAM2 should in principle be set to 0.22 for the nonlocal optB88-vdW functional[4] or to for the vdW-DF3-opt1[3] nonlocal functional.
The complete INCAR file for the nonlocal van der Waals functionals mentioned above can be found at Nonlocal vdW-DF functionals.
Related tags and articles
PARAM1, GGA, Nonlocal vdW-DF functionals
References
- ↑ a b J. Klimeš, D. R. Bowler, and A. Michaelides, Phys. Rev. B 83, 195131 (2011).
- ↑ a b I. Hamada, Phys. Rev. B 89, 121103(R) (2014).
- ↑ a b c d D. Chakraborty, K. Berland, and T. Thonhauser, Next-Generation Nonlocal van der Waals Density Functional, J. Chem. Theory Comput. 16, 5893 (2020).
- ↑ a b J. Klimeš, D. R. Bowler, and A. Michaelides, J. Phys.: Condens. Matter 22, 022201 (2010).