mirror of
https://github.com/pfloos/quack
synced 2025-05-07 07:35:02 +02:00
57 lines
1.5 KiB
Fortran
57 lines
1.5 KiB
Fortran
double precision function cRGW_Im_SigC(p,Re_w,Im_w,eta,nBas,nC,nO,nV,nR,nS,Re_e,Im_e,Om,rho)
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! Compute diagonal of the correlation part of the 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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integer,intent(in) :: p
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double precision,intent(in) :: Re_w
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double precision,intent(in) :: Im_w
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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) :: Re_e(nBas)
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double precision,intent(in) :: Im_e(nBas)
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double precision,intent(in) :: Om(nS)
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double precision,intent(in) :: rho(nBas,nBas,nS)
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! Local variables
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integer :: i,a,m
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double precision :: num,eps,eta_tilde
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! Initialize
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cRGW_Im_SigC = 0d0
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! Occupied part of the correlation self-energy
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do i=nC+1,nO
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do m=1,nS
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eps = Re_w - Re_e(i) + Om(m)
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eta_tilde = eta - Im_w + Im_e(i)
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num = 2d0*rho(p,i,m)**2
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cRGW_Im_SigC = cRGW_Im_SigC + num*eta_tilde/(eps**2 + eta_tilde**2)
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end do
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end do
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! Virtual part of the correlation self-energy
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do a=nO+1,nBas-nR
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do m=1,nS
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eps = Re_w - Re_e(a) - Om(m)
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eta_tilde = eta + Im_w - Im_e(a)
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num = 2d0*rho(p,a,m)**2
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cRGW_Im_SigC =cRGW_Im_SigC - num*eta_tilde/(eps**2 + eta_tilde**2)
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end do
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end do
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end function
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