mirror of
https://github.com/pfloos/quack
synced 2025-01-11 13:38:17 +01:00
95 lines
2.2 KiB
Fortran
95 lines
2.2 KiB
Fortran
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subroutine GTeh_self_energy(eta,nBas,nC,nO,nV,nR,nS,e,Om,rhoL,rhoR,EcGM,SigC)
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! Compute correlation part of the self-energy for GTeh
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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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double precision,intent(in) :: e(nBas)
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double precision,intent(in) :: Om(nS)
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double precision,intent(in) :: rhoL(nBas,nBas,nS)
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double precision,intent(in) :: rhoR(nBas,nBas,nS)
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! Local variables
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integer :: i,j,a,b
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integer :: p,q,r
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integer :: m
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double precision :: eps
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! Output variables
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double precision,intent(out) :: EcGM
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double precision,intent(out) :: SigC(nBas,nBas)
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! Initialize
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SigC(:,:) = 0d0
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!----------------!
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! GW self-energy !
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!----------------!
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! Occupied part of the correlation self-energy
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!$OMP PARALLEL &
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!$OMP SHARED(SigC,rho,eta,nS,nC,nO,nBas,nR,e,Om) &
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!$OMP PRIVATE(m,i,q,p,eps) &
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!$OMP DEFAULT(NONE)
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!$OMP DO
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do q=nC+1,nBas-nR
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do p=nC+1,nBas-nR
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do m=1,nS
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do i=nC+1,nO
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eps = e(p) - e(i) + Om(m)
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SigC(p,q) = SigC(p,q) + rhoL(i,p,m)*rhoR(i,q,m)*eps/(eps**2 + eta**2)
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end do
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end do
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end do
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end do
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!$OMP END DO
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!$OMP END PARALLEL
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! Virtual part of the correlation self-energy
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!$OMP PARALLEL &
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!$OMP SHARED(SigC,rho,eta,nS,nC,nO,nBas,nR,e,Om) &
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!$OMP PRIVATE(m,a,q,p,eps) &
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!$OMP DEFAULT(NONE)
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!$OMP DO
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do q=nC+1,nBas-nR
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do p=nC+1,nBas-nR
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do m=1,nS
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do a=nO+1,nBas-nR
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eps = e(p) - e(a) - Om(m)
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SigC(p,q) = SigC(p,q) + rhoL(p,a,m)*rhoR(q,a,m)*eps/(eps**2 + eta**2)
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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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!$OMP END DO
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!$OMP END PARALLEL
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! Galitskii-Migdal correlation energy
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EcGM = 0d0
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do m=1,nS
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do a=nO+1,nBas-nR
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do i=nC+1,nO
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eps = e(a) - e(i) + Om(m)
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EcGM = EcGM - rhoL(i,a,m)*rhoR(i,a,m)*eps/(eps**2 + eta**2)
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end do
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end do
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end do
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end subroutine
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