2019-03-13 11:07:31 +01:00
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subroutine exchange_potential(rung,DFA,nEns,wEns,nGrid,weight,nBas,P,ERI,AO,dAO,rho,drho,Fx,FxHF)
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! Compute the exchange potential
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implicit none
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include 'parameters.h'
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! Input variables
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integer,intent(in) :: rung
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character(len=12),intent(in) :: DFA
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integer,intent(in) :: nEns
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double precision,intent(in) :: wEns(nEns)
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integer,intent(in) :: nGrid
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double precision,intent(in) :: weight(nGrid)
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integer,intent(in) :: nBas
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double precision,intent(in) :: P(nBas,nBas)
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double precision,intent(in) :: ERI(nBas,nBas,nBas,nBas)
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double precision,intent(in) :: AO(nBas,nGrid)
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double precision,intent(in) :: dAO(ncart,nBas,nGrid)
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double precision,intent(in) :: rho(nGrid)
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double precision,intent(in) :: drho(ncart,nGrid)
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! Local variables
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double precision,allocatable :: FxLDA(:,:),FxGGA(:,:)
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double precision :: cX,aX
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! Output variables
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double precision,intent(out) :: Fx(nBas,nBas),FxHF(nBas,nBas)
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! Memory allocation
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select case (rung)
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! Hartree calculation
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2020-03-16 22:08:04 +01:00
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2019-03-13 11:07:31 +01:00
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case(0)
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Fx(:,:) = 0d0
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! LDA functionals
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case(1)
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call lda_exchange_potential(DFA,nEns,wEns,nGrid,weight,nBas,AO,rho,Fx)
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! GGA functionals
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case(2)
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call gga_exchange_potential(DFA,nEns,wEns,nGrid,weight,nBas,AO,dAO,rho,drho,Fx)
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! Hybrid functionals
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case(4)
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allocate(FxLDA(nBas,nBas),FxGGA(nBas,nBas))
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cX = 0.20d0
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aX = 0.72d0
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call lda_exchange_potential(DFA,nGrid,weight,nBas,AO,rho,FxLDA)
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call gga_exchange_potential(DFA,nGrid,weight,nBas,AO,dAO,rho,drho,FxGGA)
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call fock_exchange_potential(nBas,P,ERI,FxHF)
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Fx(:,:) = FxLDA(:,:) &
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+ cX*(FxHF(:,:) - FxLDA(:,:)) &
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+ aX*(FxGGA(:,:) - FxLDA(:,:))
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! Hartree-Fock calculation
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case(666)
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call fock_exchange_potential(nBas,P,ERI,FxHF)
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Fx(:,:) = FxHF(:,:)
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end select
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end subroutine exchange_potential
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