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https://github.com/pfloos/quack
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50 lines
1.1 KiB
Fortran
50 lines
1.1 KiB
Fortran
subroutine lda_exchange_energy(DFA,LDA_centered,nEns,wEns,nGrid,weight,rho,Ex)
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! Select LDA exchange functional
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implicit none
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include 'parameters.h'
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! Input variables
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character(len=12),intent(in) :: DFA
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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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integer,intent(in) :: nGrid
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double precision,intent(in) :: weight(nGrid)
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double precision,intent(in) :: rho(nGrid)
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! Output variables
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double precision,intent(out) :: Ex
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! Select correlation functional
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select case (DFA)
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case ('S51')
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call S51_lda_exchange_energy(nGrid,weight,rho,Ex)
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case ('RS51')
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call RS51_lda_exchange_energy(nGrid,weight,rho,Ex)
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case ('RMFL20')
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call RMFL20_lda_exchange_energy(LDA_centered,nEns,wEns,nGrid,weight,rho,Ex)
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case ('RCC')
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call RCC_lda_exchange_energy(nEns,wEns,nGrid,weight,rho,Ex)
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case default
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call print_warning('!!! LDA exchange functional not available !!!')
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stop
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end select
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end subroutine lda_exchange_energy
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