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https://github.com/pfloos/quack
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92 lines
2.3 KiB
Fortran
92 lines
2.3 KiB
Fortran
subroutine dynamic_Tmatrix_A(eta,nBas,nC,nO,nV,nR,nS,nOO,nVV,lambda,eGT,Omega1,Omega2,rho1,rho2,OmBSE,TA,ZA)
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! Compute the dynamic part of the Bethe-Salpeter equation matrices for GT
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implicit none
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include 'parameters.h'
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! Input variables
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double precision,intent(in) :: eta
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integer,intent(in) :: nBas
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integer,intent(in) :: nC
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integer,intent(in) :: nO
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integer,intent(in) :: nV
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integer,intent(in) :: nR
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integer,intent(in) :: nS
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integer,intent(in) :: nOO
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integer,intent(in) :: nVV
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double precision,intent(in) :: lambda
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double precision,intent(in) :: eGT(nBas)
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double precision,intent(in) :: OmBSE
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double precision,intent(in) :: Omega1(nVV)
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double precision,intent(in) :: Omega2(nOO)
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double precision,intent(in) :: rho1(nBas,nBas,nVV)
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double precision,intent(in) :: rho2(nBas,nBas,nOO)
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! Local variables
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double precision :: chi
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double precision :: eps
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integer :: i,j,a,b,ia,jb,cd,kl
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! Output variables
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double precision,intent(out) :: TA(nS,nS)
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double precision,intent(out) :: ZA(nS,nS)
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! Initialization
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TA(:,:) = 0d0
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ZA(:,:) = 0d0
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! Build dynamic A matrix
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ia = 0
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do i=nC+1,nO
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do a=nO+1,nBas-nR
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ia = ia + 1
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jb = 0
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do j=nC+1,nO
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do b=nO+1,nBas-nR
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jb = jb + 1
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chi = 0d0
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do cd=1,nVV
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eps = + OmBSE - Omega1(cd) + (eGT(i) + eGT(j))
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chi = chi + rho1(i,b,cd)*rho1(a,j,cd)*eps/(eps**2 + eta**2)
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end do
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do kl=1,nOO
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eps = + OmBSE + Omega2(kl) - (eGT(a) + eGT(b))
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chi = chi + rho2(i,b,kl)*rho2(a,j,kl)*eps/(eps**2 + eta**2)
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end do
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TA(ia,jb) = TA(ia,jb) - lambda*chi
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chi = 0d0
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do cd=1,nVV
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eps = + OmBSE - Omega1(cd) + (eGT(i) + eGT(j))
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chi = chi + rho1(i,b,cd)*rho1(a,j,cd)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
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end do
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do kl=1,nOO
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eps = + OmBSE + Omega2(kl) - (eGT(a) + eGT(b))
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chi = chi + rho2(i,b,kl)*rho2(a,j,kl)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
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end do
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ZA(ia,jb) = ZA(ia,jb) + lambda*chi
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end do
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end do
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end do
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end do
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end subroutine dynamic_Tmatrix_A
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