List of hybrid functionals: Difference between revisions

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  {{TAG|GGA}} = CA (or PZ)
  {{TAG|GGA}} = CA (or PZ)
  {{TAG|HFSCREEN}} = 0.75 # Optimal value for solids
  {{TAG|HFSCREEN}} = 0.75 # Optimal value for solids
  {{TAG|ALDAC}} = 1.0    # Necessary since correlation is not included when {{TAG|AEXX}}=1
  {{TAG|ALDAC}} = 1.0    # Necessary since correlation is by default not included when {{TAG|AEXX}}=1


:with the default value {{TAG|AEXX}}=1.
:with the default value {{TAG|AEXX}}=1.
Line 70: Line 70:
  {{TAG|GGA}} = PE
  {{TAG|GGA}} = PE
  {{TAG|HFSCREEN}} = 0.91 # Optimal value for the enthalpies of formation of molecules
  {{TAG|HFSCREEN}} = 0.91 # Optimal value for the enthalpies of formation of molecules
  {{TAG|ALDAC}} = 1.0    # Necessary since correlation is not included when {{TAG|AEXX}}=1
  {{TAG|ALDAC}} = 1.0    # Necessary since correlation is by default not included when {{TAG|AEXX}}=1
  {{TAG|AGGAC}} = 1.0    # Necessary since correlation is not included when {{TAG|AEXX}}=1
  {{TAG|AGGAC}} = 1.0    # Necessary since correlation is by default not included when {{TAG|AEXX}}=1


:with the default values {{TAG|AEXX}}=1.
:with the default values {{TAG|AEXX}}=1.
Line 82: Line 82:
  {{TAG|GGA}} = CA (or PZ)
  {{TAG|GGA}} = CA (or PZ)
  {{TAG|HFSCREEN}} = <math>k_{\rm TF}</math>
  {{TAG|HFSCREEN}} = <math>k_{\rm TF}</math>
  {{TAG|ALDAC}} = 1.0    # Necessary since correlation is not included when {{TAG|AEXX}}=1
  {{TAG|ALDAC}} = 1.0    # Necessary since correlation is by default not included when {{TAG|AEXX}}=1
  {{TAG|AGGAC}} = 1.0    # Necessary since correlation is not included when {{TAG|AEXX}}=1
  {{TAG|AGGAC}} = 1.0    # Necessary since correlation is by default not included when {{TAG|AEXX}}=1


:with the default value {{TAG|AEXX}}=1 and where <math>k_{\rm TF}</math> is the Thomas-Fermi screening. More details can be found at {{TAG|LTHOMAS}} as well as [[Hybrid_functionals:_formalism#HF_exchange_at_short_range_(exponential_screening)|here]].
:with the default value {{TAG|AEXX}}=1 and where <math>k_{\rm TF}</math> is the Thomas-Fermi screening. More details can be found at {{TAG|LTHOMAS}} as well as [[Hybrid_functionals:_formalism#HF_exchange_at_short_range_(exponential_screening)|here]].

Revision as of 20:33, 3 February 2026

A certain number of unscreened and screened hybrid functionals are available in VASP, and furthermore if VASP is compiled with the library of exchange-correlation functionals Libxc, then most of the existing hybrid functionals can be used[1]. Examples of INCAR files are shown below. Since VASP.6.4.0 it is possible to use hybrid functionals that mix meta-GGA and Hartree-Fock exchange. Note that it is in general recommended to use the PBE POTCAR files for hybrid functionals.

Range-separated hybrid functionals

LHFCALC = .TRUE.
GGA = PE
HFSCREEN = 0.2
with the default values AEXX=0.25, AGGAX=1-AEXX=0.75, AGGAC=1, and ALDAC=1.

LHFCALC = .TRUE.
GGA = PE
HFSCREEN = 0.3
with the default values AEXX=0.25, AGGAX=1-AEXX=0.75, AGGAC=1, and ALDAC=1.

LHFCALC = .TRUE.
GGA = PS
HFSCREEN = 0.2
with the default values AEXX=0.25, AGGAX=1-AEXX=0.75, AGGAC=1, and ALDAC=1.

  • Dielectric-dependent hybrid (DDH) RS-DDH[7]
LHFCALC = .TRUE.
LMODELHF = .TRUE.
AEXX = [math]\displaystyle{ \varepsilon^{-1} }[/math]
BEXX = 0.25
HFSCREEN = [math]\displaystyle{ \mu }[/math]
GGA = PE
where [math]\displaystyle{ \varepsilon^{-1} }[/math] is the inverse dielectric constant and [math]\displaystyle{ \mu }[/math] is the range-separation parameter. See a detailed description of the DDH functionals in the documentation for the LMODELHF tag as well as here.

  • Dielectric-dependent hybrid (DDH) DD-RSH-CAM,[8]DSH[9]
LHFCALC = .TRUE.
LMODELHF = .TRUE.
AEXX = [math]\displaystyle{ \varepsilon^{-1} }[/math]
HFSCREEN = [math]\displaystyle{ \mu }[/math]
GGA = PE
with the default value BEXX=1 and where [math]\displaystyle{ \varepsilon^{-1} }[/math] is the inverse dielectric constant and [math]\displaystyle{ \mu }[/math] is the range-separation parameter. See a detailed description of the DDH functionals in the documentation for the LMODELHF tag as well as here.

LHFCALC = .TRUE.
LRHFCALC = .TRUE.
GGA = CA (or PZ)
HFSCREEN = 0.75 # Optimal value for solids
ALDAC = 1.0     # Necessary since correlation is by default not included when AEXX=1
with the default value AEXX=1.

LHFCALC = .TRUE.
LRHFCALC = .TRUE.
GGA = PE
HFSCREEN = 0.91 # Optimal value for the enthalpies of formation of molecules
ALDAC = 1.0     # Necessary since correlation is by default not included when AEXX=1
AGGAC = 1.0     # Necessary since correlation is by default not included when AEXX=1
with the default values AEXX=1.

LHFCALC = .TRUE.
LTHOMAS = .TRUE.
GGA = CA (or PZ)
HFSCREEN = [math]\displaystyle{ k_{\rm TF} }[/math]
ALDAC = 1.0     # Necessary since correlation is by default not included when AEXX=1
AGGAC = 1.0     # Necessary since correlation is by default not included when AEXX=1
with the default value AEXX=1 and where [math]\displaystyle{ k_{\rm TF} }[/math] is the Thomas-Fermi screening. More details can be found at LTHOMAS as well as here.

Unscreened hybrid functionals

LHFCALC = .TRUE.
GGA = PE
with the default values AEXX=0.25, AGGAX=1-AEXX=0.75, AGGAC=1, and ALDAC=1.

  • B3LYP[16] with VWN3 (or VWN5) for LDA correlation
LHFCALC = .TRUE. 
GGA     = B3 (or B5)
AEXX    = 0.2
AGGAX   = 0.72 
AGGAC   = 0.81 
ALDAC   = 0.19
with the default value ALDAX=1-AEXX=0.8.

LHFCALC = .TRUE.
GGA = LIBXC
LIBXC1 = HYB_GGA_XC_B3PW91 # or 401
AEXX = 0.2


LHFCALC = .TRUE.
GGA = LIBXC
LIBXC1 = HYB_GGA_XC_B1WC # or 412
AEXX = 0.16

  • SCAN0
LHFCALC = .TRUE.
METAGGA = SCAN
with the default values AEXX=0.25, AMGGAX=1-AEXX=0.75, and AMGGAC=1.

  • Hartree-Fock (no correlation)
LHFCALC = .TRUE. 
AEXX    = 1

with the default values AGGAX=1-AEXX=0, ALDAC=0, and AGGAC=0.


Mind: Note the default values when LHFCALC=.TRUE.:

Related tags and articles

GGA, METAGGA, LIBXC1, LIBXC2, AEXX, BEXX, ALDAX, ALDAC, AGGAX, AGGAC, AMGGAX, AMGGAC, LHFCALC, HFSCREEN, LMODELHF, LTHOMAS, LRHFCALC, Hybrid functionals: formalism

References

  1. ↑ https://libxc.gitlab.io/functionals/
  2. ↑ A. V. Krukau , O. A. Vydrov, A. F. Izmaylov, and G. E. Scuseria, J. Chem. Phys. 125, 224106 (2006).
  3. ↑ J. Heyd, G. E. Scuseria, and M. Ernzerhof, J. Chem. Phys. 118, 8207 (2003).
  4. ↑ J. Heyd and G. E. Scuseria, J. Chem. Phys. 121, 1187 (2004).
  5. ↑ J. Heyd, G. E. Scuseria, and M. Ernzerhof, J. Chem. Phys. 124, 219906 (2006).
  6. ↑ L. Schimka, J. Harl, and G. Kresse, J. Chem. Phys. 134, 024116 (2011).
  7. ↑ J. H. Skone, M. Govoni, and G. Galli, Nonempirical range-separated hybrid functionals for solids and molecules, Phys. Rev. B 93, 235106 (2016).
  8. ↑ W. Chen, G. Miceli, G.M. Rignanese, and A. Pasquarello, Nonempirical dielectric-dependent hybrid functional with range separation for semiconductors and insulators, Phys. Rev. Mater. 2, 073803 (2018).
  9. ↑ Z.H. Cui, Y.C. Wang, M.Y. Zhang, X. Xu, and H. Jiang, Doubly Screened Hybrid Functional: An Accurate First-Principles Approach for Both Narrow- and Wide-Gap Semiconductors J. Phys. Chem. Lett., 9, 2338-2345 (2018).
  10. ↑ I. C. Gerber, J. G. Ángyán, M. Marsman, and G. Kresse, Range separated hybrid density functional with long-range Hartree-Fock exchange applied to solids, J. Chem. Phys. 127, 054101 (2007).
  11. ↑ I. C. Gerber and J. G. Ángyán, Hybrid functional with separated range, Chem. Phys. Lett. 415, 100 (2005).
  12. ↑ D. M. Bylander and L. Kleinman, Phys. Rev. B 41, 7868 (1990).
  13. ↑ J. P. Perdew, M. Ernzerhof, and K. Burke, J. Chem. Phys. 105, 9982 (1996).
  14. ↑ M. Ernzerhof and G. E. Scuseria, J. Chem. Phys. 110, 5029 (1999).
  15. ↑ C. Adamo and V. Barone, Phys. Rev. Lett., 110, 6158 (1999).
  16. ↑ P. J. Stephens, F. J. Devlin, C. F. Chabalowski, and M. J. Frisch, J. Phys. Chem. 98, 11623 (1994).
  17. ↑ A. D. Becke, J. Chem. Phys. 98, 5648 (1993).
  18. ↑ D. I. Bilc, R. Orlando, R. Shaltaf, G.-M. Rignanese, J. Iniguez, and P. Ghosez, Phys. Rev. B 77, 165107 (2008).
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