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https://github.com/pfloos/quack
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56 lines
1.5 KiB
Fortran
56 lines
1.5 KiB
Fortran
subroutine hartree_individual_energy(nBas,nEns,Pw,P,ERI,LZH,EH)
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! Compute the hartree contribution to the individual energies
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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) :: nBas
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integer,intent(in) :: nEns
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double precision,intent(in) :: Pw(nBas,nBas,nspin)
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double precision,intent(in) :: P(nBas,nBas,nspin,nEns)
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double precision,intent(in) :: ERI(nBas,nBas,nBas,nBas)
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! Local variables
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double precision,allocatable :: J(:,:,:)
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double precision,external :: trace_matrix
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integer :: iEns
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integer :: ispin
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! Output variables
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double precision,intent(out) :: LZH(nsp)
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double precision,intent(out) :: EH(nsp,nEns)
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! Compute HF exchange matrix
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allocate(J(nBas,nBas,nspin))
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LZH(:) = 0.d0
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EH(:,:) = 0.d0
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do ispin=1,nspin
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call hartree_potential(nBas,Pw(:,:,ispin),ERI,J(:,:,ispin))
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end do
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LZH(1) = - 0.5d0*trace_matrix(nBas,matmul(Pw(:,:,1),J(:,:,1)))
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LZH(2) = - 0.5d0*trace_matrix(nBas,matmul(Pw(:,:,1),J(:,:,2))) &
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- 0.5d0*trace_matrix(nBas,matmul(Pw(:,:,2),J(:,:,1)))
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LZH(3) = - 0.5d0*trace_matrix(nBas,matmul(Pw(:,:,2),J(:,:,2)))
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do iEns=1,nEns
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EH(1,iEns) = trace_matrix(nBas,matmul(P(:,:,1,iEns),J(:,:,1)))
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EH(2,iEns) = trace_matrix(nBas,matmul(P(:,:,1,iEns),J(:,:,2))) &
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+ trace_matrix(nBas,matmul(P(:,:,2,iEns),J(:,:,1)))
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EH(3,iEns) = trace_matrix(nBas,matmul(P(:,:,2,iEns),J(:,:,2)))
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end do
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end subroutine hartree_individual_energy
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