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https://github.com/pfloos/quack
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102 lines
2.6 KiB
Fortran
102 lines
2.6 KiB
Fortran
subroutine GTpp_self_energy(eta,nBas,nC,nO,nV,nR,nOO,nVV,e,Om1,rho1,Om2,rho2,EcGM,Sig,Z)
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! Compute the correlation part of the T-matrix self-energy and the renormalization factor
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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) :: Om1(nVV)
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double precision,intent(in) :: rho1(nBas,nBas,nVV)
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double precision,intent(in) :: Om2(nOO)
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double precision,intent(in) :: rho2(nBas,nBas,nOO)
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! Local variables
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integer :: i,j,a,b,p,q,cd,kl
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double precision :: num,eps
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! Output variables
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double precision,intent(inout):: EcGM
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double precision,intent(inout):: Sig(nBas,nBas)
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double precision,intent(inout):: Z(nBas)
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!----------------------------------------------
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! Occupied part of the T-matrix self-energy
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!----------------------------------------------
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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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do cd=1,nVV
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eps = e(p) + e(i) - Om1(cd)
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num = rho1(p,i,cd)*rho1(q,i,cd)
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Sig(p,q) = Sig(p,q) + num*eps/(eps**2 + eta**2)
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if(p == q) Z(p) = Z(p) - num*(eps**2 - eta**2)/(eps**2 + eta**2)**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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!----------------------------------------------
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! Virtual part of the T-matrix self-energy
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!----------------------------------------------
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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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do kl=1,nOO
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eps = e(p) + e(a) - Om2(kl)
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num = rho2(p,a,kl)*rho2(q,a,kl)
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Sig(p,q) = Sig(p,q) + num*eps/(eps**2 + eta**2)
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if(p == q) Z(p) = Z(p) - num*(eps**2 - eta**2)/(eps**2 + eta**2)**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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!----------------------------------------------
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! Galitskii-Migdal correlation energy
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!----------------------------------------------
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do i=nC+1,nO
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do j=nC+1,nO
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do cd=1,nVV
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eps = e(i) + e(j) - Om1(cd)
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num = rho1(i,j,cd)*rho1(i,j,cd)
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EcGM = EcGM + num*eps/(eps**2 + eta**2)
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enddo
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enddo
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enddo
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do a=nO+1,nBas-nR
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do b=nO+1,nBas-nR
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do kl=1,nOO
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eps = e(a) + e(b) - Om2(kl)
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num = rho2(a,b,kl)*rho2(a,b,kl)
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EcGM = EcGM - num*eps/(eps**2 + eta**2)
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enddo
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enddo
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enddo
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end subroutine
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