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QuAcK/src/GW/unrestricted_self_energy_correlation.f90

119 lines
2.9 KiB
Fortran

subroutine unrestricted_self_energy_correlation(eta,nBas,nC,nO,nV,nR,nSt,e,Omega,rho,SigC,EcGM)
! Compute diagonal of the correlation part of the self-energy
implicit none
include 'parameters.h'
! Input variables
double precision,intent(in) :: eta
integer,intent(in) :: nBas
integer,intent(in) :: nC(nspin)
integer,intent(in) :: nO(nspin)
integer,intent(in) :: nV(nspin)
integer,intent(in) :: nR(nspin)
integer,intent(in) :: nSt
double precision,intent(in) :: e(nBas,nspin)
double precision,intent(in) :: Omega(nSt)
double precision,intent(in) :: rho(nBas,nBas,nSt,nspin)
! Local variables
integer :: i,a,p,q,jb
double precision :: eps
! Output variables
double precision,intent(out) :: SigC(nBas,nBas,nspin)
double precision :: EcGM(nspin)
! Initialize
SigC(:,:,:) = 0d0
EcGM(:) = 0d0
!--------------!
! Spin-up part !
!--------------!
! Occupied part of the correlation self-energy
do p=nC(1)+1,nBas-nR(1)
do q=nC(1)+1,nBas-nR(1)
do i=nC(1)+1,nO(1)
do jb=1,nSt
eps = e(p,1) - e(i,1) + Omega(jb)
SigC(p,q,1) = SigC(p,q,1) + rho(p,i,jb,1)*rho(q,i,jb,1)*eps/(eps**2 + eta**2)
end do
end do
end do
end do
! Virtual part of the correlation self-energy
do p=nC(1)+1,nBas-nR(1)
do q=nC(1)+1,nBas-nR(1)
do a=nO(1)+1,nBas-nR(1)
do jb=1,nSt
eps = e(p,1) - e(a,1) - Omega(jb)
SigC(p,q,1) = SigC(p,q,1) + rho(p,a,jb,1)*rho(q,a,jb,1)*eps/(eps**2 + eta**2)
end do
end do
end do
end do
! GM correlation energy
do i=nC(1)+1,nO(1)
do a=nO(1)+1,nBas-nR(1)
do jb=1,nSt
eps = e(a,1) - e(i,1) + Omega(jb)
EcGM(1) = EcGM(1) - rho(a,i,jb,1)**2*eps/(eps**2 + eta**2)
end do
end do
end do
!----------------!
! Spin-down part !
!----------------!
! Occupied part of the correlation self-energy
do p=nC(2)+1,nBas-nR(2)
do q=nC(2)+1,nBas-nR(2)
do i=nC(2)+1,nO(2)
do jb=1,nSt
eps = e(p,2) - e(i,2) + Omega(jb)
SigC(p,q,2) = SigC(p,q,2) + rho(p,i,jb,2)*rho(q,i,jb,2)*eps/(eps**2 + eta**2)
end do
end do
end do
end do
! Virtual part of the correlation self-energy
do p=nC(2)+1,nBas-nR(2)
do q=nC(2)+1,nBas-nR(2)
do a=nO(2)+1,nBas-nR(2)
do jb=1,nSt
eps = e(p,2) - e(a,2) - Omega(jb)
SigC(p,q,2) = SigC(p,q,2) + rho(p,a,jb,2)*rho(q,a,jb,2)*eps/(eps**2 + eta**2)
end do
end do
end do
end do
! GM correlation energy
do i=nC(2)+1,nO(2)
do a=nO(2)+1,nBas-nR(2)
do jb=1,nSt
eps = e(a,2) - e(i,2) + Omega(jb)
EcGM(2) = EcGM(2) - rho(a,i,jb,2)**2*eps/(eps**2 + eta**2)
end do
end do
end do
end subroutine unrestricted_self_energy_correlation