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When using GPAW with the option xc='LDA', which of the potentials in https://tddft.org/programs/libxc/functionals/ is used ? Or which combination of them? Is it "LDA_X" or or one of the "LDA_XC" ?

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According to GPAW's documentation, GPAW would use its own LDA implementation, but if I interpret the table correctly, that should correspond to libxc's LDA_X + LDA_C_PW:

Exchange-Correlation functional

Some of the most commonly used exchange-correlation functionals are listed below.

xc full libxc keyword description reference
LDA LDA_X+LDA_C_PW Local density approximation 1
PBE GGA_X_PBE+GGA_C_PBE Perdew, Burke, Ernzerhof 2
revPBE GGA_X_PBE_R+GGA_C_PBE revised PBE 3
RPBE GGA_X_RPBE+GGA_C_PBE revised revPBE 4
PBE0 HYB_GGA_XC_PBEH Known as PBE0 5
B3LYP HYB_GGA_XC_B3LYP B3LYP (as in Gaussian Inc.) 6

LDA is the default value. The next three ones are of generalized gradient approximation (GGA) type, and the last two are hybrid functionals.

For the list of all functionals available in GPAW see Exchange-correlation functionals module.

GPAW uses the functionals from libxc by default (except for LDA, PBE, revPBE, RPBE and PW91 where GPAW’s own implementation is used).

(The last sentence is bolded by me for emphasis.)

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