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quack/src/QuAcK/G0T0.f90
Pierre-Francois Loos 72abe8a4f6 bug
2019-10-28 16:34:09 +01:00

193 lines
6.8 KiB
Fortran
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subroutine G0T0(BSE,singlet_manifold,triplet_manifold,eta,nBas,nC,nO,nV,nR,ENuc,ERHF,ERI,eHF,eG0T0)
! Perform G0W0 calculation with a T-matrix self-energy (G0T0)
implicit none
include 'parameters.h'
! Input variables
logical,intent(in) :: BSE
logical,intent(in) :: singlet_manifold
logical,intent(in) :: triplet_manifold
double precision,intent(in) :: eta
integer,intent(in) :: nBas,nC,nO,nV,nR
double precision,intent(in) :: ENuc
double precision,intent(in) :: ERHF
double precision,intent(in) :: eHF(nBas)
double precision,intent(in) :: ERI(nBas,nBas,nBas,nBas)
! Local variables
integer :: ispin
integer :: nOOs,nOOt
integer :: nVVs,nVVt
double precision :: EcRPA(nspin)
double precision :: EcBSE(nspin)
double precision,allocatable :: Omega1s(:),Omega1t(:)
double precision,allocatable :: X1s(:,:),X1t(:,:)
double precision,allocatable :: Y1s(:,:),Y1t(:,:)
double precision,allocatable :: rho1s(:,:,:),rho1t(:,:,:)
double precision,allocatable :: Omega2s(:),Omega2t(:)
double precision,allocatable :: X2s(:,:),X2t(:,:)
double precision,allocatable :: Y2s(:,:),Y2t(:,:)
double precision,allocatable :: rho2s(:,:,:),rho2t(:,:,:)
double precision,allocatable :: SigT(:)
double precision,allocatable :: Z(:)
! Output variables
double precision,intent(out) :: eG0T0(nBas)
! Hello world
write(*,*)
write(*,*)'************************************************'
write(*,*)'| One-shot G0T0 calculation |'
write(*,*)'************************************************'
write(*,*)
! Dimensions of the rr-RPA linear reponse matrices
nOOs = nO*(nO + 1)/2
nVVs = nV*(nV + 1)/2
nOOt = nO*(nO - 1)/2
nVVt = nV*(nV - 1)/2
! Memory allocation
allocate(Omega1s(nVVs),X1s(nVVs,nVVs),Y1s(nOOs,nVVs), &
Omega2s(nOOs),X2s(nVVs,nOOs),Y2s(nOOs,nOOs), &
rho1s(nBas,nO-nC,nVVs),rho2s(nBas,nV-nR,nOOs), &
Omega1t(nVVt),X1t(nVVt,nVVt),Y1t(nOOt,nVVt), &
Omega2t(nOOt),X2t(nVVt,nOOt),Y2t(nOOt,nOOt), &
rho1t(nBas,nO-nC,nVVt),rho2t(nBas,nV-nR,nOOt), &
SigT(nBas),Z(nBas))
!----------------------------------------------
! Singlet manifold
!----------------------------------------------
ispin = 1
! Compute linear response
call linear_response_pp(ispin,.false.,nBas,nC,nO,nV,nR, &
nOOs,nVVs,eHF(:),ERI(:,:,:,:), &
Omega1s(:),X1s(:,:),Y1s(:,:), &
Omega2s(:),X2s(:,:),Y2s(:,:), &
EcRPA(ispin))
call print_excitation('pp-RPA (N+2)',ispin,nVVs,Omega1s(:))
call print_excitation('pp-RPA (N-2)',ispin,nOOs,Omega2s(:))
! Compute excitation densities for the T-matrix
call excitation_density_Tmatrix(ispin,nBas,nC,nO,nV,nR,nOOs,nVVs,ERI(:,:,:,:), &
X1s(:,:),Y1s(:,:),rho1s(:,:,:), &
X2s(:,:),Y2s(:,:),rho2s(:,:,:))
!----------------------------------------------
! Triplet manifold
!----------------------------------------------
ispin = 2
! Compute linear response
call linear_response_pp(ispin,.false.,nBas,nC,nO,nV,nR, &
nOOt,nVVt,eHF(:),ERI(:,:,:,:), &
Omega1t(:),X1t(:,:),Y1t(:,:), &
Omega2t(:),X2t(:,:),Y2t(:,:), &
EcRPA(ispin))
call print_excitation('pp-RPA (N+2)',ispin,nVVt,Omega1t(:))
call print_excitation('pp-RPA (N-2)',ispin,nOOt,Omega2t(:))
! Compute excitation densities for the T-matrix
call excitation_density_Tmatrix(ispin,nBas,nC,nO,nV,nR,nOOt,nVVt,ERI(:,:,:,:), &
X1t(:,:),Y1t(:,:),rho1t(:,:,:), &
X2t(:,:),Y2t(:,:),rho2t(:,:,:))
!----------------------------------------------
! Compute T-matrix version of the self-energy
!----------------------------------------------
call self_energy_Tmatrix_diag(eta,nBas,nC,nO,nV,nR,nOOs,nVVs,nOOt,nVVt,eHF(:), &
Omega1s(:),rho1s(:,:,:),Omega2s(:),rho2s(:,:,:), &
Omega1t(:),rho1t(:,:,:),Omega2t(:),rho2t(:,:,:), &
SigT(:))
! Compute renormalization factor for T-matrix self-energy
call renormalization_factor_Tmatrix(eta,nBas,nC,nO,nV,nR,nOOs,nVVs,nOOt,nVVt,eHF(:), &
Omega1s(:),rho1s(:,:,:),Omega2s(:),rho2s(:,:,:), &
Omega1t(:),rho1t(:,:,:),Omega2t(:),rho2t(:,:,:), &
Z(:))
!----------------------------------------------
! Solve the quasi-particle equation
!----------------------------------------------
eG0T0(:) = eHF(:) + Z(:)*SigT(:)
!----------------------------------------------
! Dump results
!----------------------------------------------
call print_G0T0(nBas,nO,eHF(:),ENuc,ERHF,SigT(:),Z(:),eG0T0(:),EcRPA(:))
! Perform BSE calculation
! if(BSE) then
! ! Singlet manifold
! if(singlet_manifold) then
! ispin = 1
! EcBSE(ispin) = 0d0
! call linear_response(ispin,.false.,.false.,.false.,nBas,nC,nO,nV,nR,nS,eHF,ERI, &
! rho(:,:,:,ispin),EcRPA(ispin),Omega(:,ispin),XpY(:,:,ispin))
! call excitation_density(nBas,nC,nO,nR,nS,ERI,XpY(:,:,ispin),rho(:,:,:,ispin))
! call linear_response(ispin,.false.,.false.,BSE,nBas,nC,nO,nV,nR,nS,eG0T0,ERI, &
! rho(:,:,:,ispin),EcBSE(ispin),Omega(:,ispin),XpY(:,:,ispin))
! call print_excitation('BSE ',ispin,nS,Omega(:,ispin))
! endif
! ! Triplet manifold
! if(triplet_manifold) then
! ispin = 2
! EcBSE(ispin) = 0d0
! call linear_response(ispin,dRPA,TDA,.false.,nBas,nC,nO,nV,nR,nS,eHF,ERI, &
! rho(:,:,:,ispin),EcRPA(ispin),Omega(:,ispin),XpY(:,:,ispin))
! call excitation_density(nBas,nC,nO,nR,nS,ERI,XpY(:,:,ispin),rho(:,:,:,ispin))
! call linear_response(ispin,dRPA,TDA,BSE,nBas,nC,nO,nV,nR,nS,eG0T0,ERI, &
! rho(:,:,:,ispin),EcBSE(ispin),Omega(:,ispin),XpY(:,:,ispin))
! call print_excitation('BSE ',ispin,nS,Omega(:,ispin))
! endif
! write(*,*)
! write(*,*)'-------------------------------------------------------------------------------'
! write(*,'(2X,A40,F15.6)') 'BSE@G0T0 correlation energy (singlet) =',EcBSE(1)
! write(*,'(2X,A40,F15.6)') 'BSE@G0T0 correlation energy (triplet) =',EcBSE(2)
! write(*,'(2X,A40,F15.6)') 'BSE@G0T0 correlation energy =',EcBSE(1) + EcBSE(2)
! write(*,'(2X,A40,F15.6)') 'BSE@G0T0 total energy =',ENuc + ERHF + EcBSE(1) + EcBSE(2)
! write(*,*)'-------------------------------------------------------------------------------'
! write(*,*)
! endif
end subroutine G0T0
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