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https://github.com/pfloos/quack
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72 lines
1.8 KiB
Fortran
72 lines
1.8 KiB
Fortran
subroutine self_energy_Tmatrix(eta,nBas,nC,nO,nV,nR,nOO,nVV,e,Omega1,Omega2,rho1,rho2,SigT)
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! Compute the correlation part of the T-matrix self-energy
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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) :: nOO
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integer,intent(in) :: nVV
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double precision,intent(in) :: e(nBas)
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double precision,intent(in) :: Omega1(nVV)
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double precision,intent(in) :: rho1(nBas,nO,nVV)
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double precision,intent(in) :: Omega2(nOO)
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double precision,intent(in) :: rho2(nBas,nV,nOO)
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! Local variables
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integer :: i,j,k,l,a,b,c,d,p,q,cd,kl
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double precision :: eps
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! Output variables
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double precision,intent(out) :: SigT(nBas,nBas)
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! Initialize
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SigT = 0d0
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! Occupied part of the T-matrix self-energy
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do p=nC+1,nBas-nR
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do q=nC+1,nBas-nR
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do i=nC+1,nO
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cd = 0
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do c=nO+1,nBas-nR
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do d=c+1,nBas-nR
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cd = cd + 1
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eps = e(p) + e(i) - Omega1(cd)
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SigT(p,q) = SigT(p,q) + 2d0*rho1(p,i,cd)*rho1(q,i,cd)*eps/(eps**2 + eta**2)
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enddo
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enddo
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enddo
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enddo
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enddo
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! Virtual part of the T-matrix self-energy
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do p=nC+1,nBas-nR
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do q=nC+1,nBas-nR
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do a=nO+1,nBas-nR
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kl = 0
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do k=nC+1,nO
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do l=k+1,nO
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kl = kl + 1
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eps = e(p) + e(a) - Omega2(kl)
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SigT(p,q) = SigT(p,q) + 2d0*rho2(p,a,kl)*rho2(q,a,kl)*eps/(eps**2 + eta**2)
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enddo
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enddo
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enddo
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enddo
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enddo
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end subroutine self_energy_Tmatrix
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