LMODELHF
LMODELHF = .TRUE. | .FALSE.
Default: LMODELHF = .FALSE.
Description: LMODELHF selects a decomposition of the exchange correlation functional based on a range separated screening, with full exchange in the short range, and AEXX in the long range.
LMODELHF=.TRUE. selects the range separated hybrid functional suggested in Ref.[1] and Ref. [2] under the name dielectric-dependent hybrid functionals (DDH) and doubly screened hybrid (DSH), respectively. These two functionals are completely identical, but for the way the amount of exact exchange is determined in the long range limit.
The corresponding functional has been implemented in VASP since VASP.5.2 released in 2009 (so way before the two publications), although the gradient contribution had been erroneously implemented and is only fixed in VASP.6. The corresponding bug fix has been made available by the authors of Ref. [2].
Related Tags and Sections
LHFCALC, HFSCREEN, AEXX, hybrid functionals, Thomas-Fermi screening, settings for specific hybrid functionals