2021-11-29 13:21:45 +01:00
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subroutine unrestricted_hybrid_exchange_energy(DFA,LDA_centered,nEns,wEns,nCC,aCC,nGrid,weight,nBas,P,FxHF, &
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2021-02-14 22:52:17 +01:00
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rho,drho,Ex,Cx_choice)
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! Compute the exchange energy for hybrid functionals
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implicit none
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include 'parameters.h'
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! Input variables
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2021-10-25 12:20:25 +02:00
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integer,intent(in) :: DFA
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2021-02-14 22:52:17 +01:00
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logical,intent(in) :: LDA_centered
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integer,intent(in) :: nEns
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double precision,intent(in) :: wEns(nEns)
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2021-11-29 13:21:45 +01:00
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integer,intent(in) :: nCC
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double precision,intent(in) :: aCC(nCC,nEns-1)
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2021-02-14 22:52:17 +01:00
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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) :: FxHF(nBas,nBas)
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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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integer,intent(in) :: Cx_choice
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! Local variables
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double precision :: ExLDA,ExGGA,ExHF
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double precision :: a0,aX
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! Output variables
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double precision,intent(out) :: Ex
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select case (DFA)
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2021-10-25 12:20:25 +02:00
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case (1)
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2021-02-14 22:52:17 +01:00
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call unrestricted_fock_exchange_energy(nBas,P,FxHF,Ex)
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2021-10-25 12:20:25 +02:00
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case (2)
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2021-02-14 22:52:17 +01:00
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a0 = 0.20d0
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aX = 0.72d0
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2021-11-29 13:21:45 +01:00
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call unrestricted_lda_exchange_energy(1,LDA_centered,nEns,wEns,nCC,aCC,nGrid,weight,&
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2021-02-14 22:52:17 +01:00
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rho,ExLDA,Cx_choice)
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2021-10-25 12:20:25 +02:00
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call unrestricted_gga_exchange_energy(2,nEns,wEns,nGrid,weight,rho,drho,ExGGA)
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call unrestricted_fock_exchange_energy(nBas,P,FxHF,ExHF)
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Ex = ExLDA &
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+ a0*(ExHF - ExLDA) &
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+ aX*(ExGGA - ExLDA)
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2021-10-25 12:20:25 +02:00
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case (3)
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2021-02-15 17:27:06 +01:00
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2021-10-25 12:20:25 +02:00
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call unrestricted_gga_exchange_energy(2,nEns,wEns,nGrid,weight,rho,drho,ExGGA)
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2021-02-15 17:27:06 +01:00
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call unrestricted_fock_exchange_energy(nBas,P,FxHF,ExHF)
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Ex = 0.5d0*ExHF + 0.5d0*ExGGA
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2021-10-25 12:20:25 +02:00
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case (4)
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2021-02-14 22:52:17 +01:00
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2021-10-25 12:20:25 +02:00
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call unrestricted_gga_exchange_energy(3,nEns,wEns,nGrid,weight,rho,drho,ExGGA)
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call unrestricted_fock_exchange_energy(nBas,P,FxHF,ExHF)
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Ex = 0.25d0*ExHF + 0.75d0*ExGGA
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case default
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call print_warning('!!! Hybrid exchange energy not available !!!')
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stop
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end select
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end subroutine unrestricted_hybrid_exchange_energy
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