mirror of https://github.com/pfloos/quack
141 lines
4.4 KiB
Fortran
141 lines
4.4 KiB
Fortran
subroutine Bethe_Salpeter_pp(TDA_W,TDA,singlet,triplet,eta,nBas,nC,nO,nV,nR,nS,ERI,dipole_int,eW,eGW,EcBSE)
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! Compute the Bethe-Salpeter excitation energies at the pp level
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implicit none
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include 'parameters.h'
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! Input variables
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logical,intent(in) :: TDA_W
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logical,intent(in) :: TDA
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logical,intent(in) :: singlet
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logical,intent(in) :: triplet
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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) :: eW(nBas)
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double precision,intent(in) :: eGW(nBas)
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double precision,intent(in) :: ERI(nBas,nBas,nBas,nBas)
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double precision,intent(in) :: dipole_int(nBas,nBas,ncart)
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! Local variables
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integer :: ispin
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integer :: isp_W
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integer :: nOO
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integer :: nVV
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double precision :: EcRPA
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double precision,allocatable :: OmRPA(:)
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double precision,allocatable :: XpY_RPA(:,:)
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double precision,allocatable :: XmY_RPA(:,:)
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double precision,allocatable :: rho_RPA(:,:,:)
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double precision,allocatable :: Omega1(:)
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double precision,allocatable :: X1(:,:)
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double precision,allocatable :: Y1(:,:)
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double precision,allocatable :: Omega2(:)
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double precision,allocatable :: X2(:,:)
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double precision,allocatable :: Y2(:,:)
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double precision,allocatable :: WB(:,:)
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double precision,allocatable :: WC(:,:)
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double precision,allocatable :: WD(:,:)
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! Output variables
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double precision,intent(out) :: EcBSE(nspin)
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!---------------------------------
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! Compute (singlet) RPA screening
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!---------------------------------
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isp_W = 1
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EcRPA = 0d0
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! Memory allocation
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allocate(OmRPA(nS),XpY_RPA(nS,nS),XmY_RPA(nS,nS),rho_RPA(nBas,nBas,nS))
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call linear_response(isp_W,.true.,TDA_W,eta,nBas,nC,nO,nV,nR,nS,1d0,eW,ERI, &
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EcRPA,OmRPA,XpY_RPA,XmY_RPA)
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call excitation_density(nBas,nC,nO,nR,nS,ERI,XpY_RPA,rho_RPA)
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!-------------------
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! Singlet manifold
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!-------------------
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if(singlet) then
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ispin = 1
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EcBSE(ispin) = 0d0
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nOO = nO*(nO+1)/2
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nVV = nV*(nV+1)/2
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allocate(Omega1(nVV),X1(nVV,nVV),Y1(nOO,nVV), &
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Omega2(nOO),X2(nVV,nOO),Y2(nOO,nOO), &
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WB(nVV,nOO),WC(nVV,nVV),WD(nOO,nOO))
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if(.not.TDA) call static_screening_WB_pp(ispin,eta,nBas,nC,nO,nV,nR,nS,nOO,nVV,1d0,ERI,OmRPA,rho_RPA,WB)
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call static_screening_WC_pp(ispin,eta,nBas,nC,nO,nV,nR,nS,nOO,nVV,1d0,ERI,OmRPA,rho_RPA,WC)
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call static_screening_WD_pp(ispin,eta,nBas,nC,nO,nV,nR,nS,nOO,nVV,1d0,ERI,OmRPA,rho_RPA,WD)
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! Compute BSE excitation energies
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call linear_response_pp_BSE(ispin,TDA,.true.,nBas,nC,nO,nV,nR,nOO,nVV,1d0,eGW,ERI,WB,WC,WD, &
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Omega1,X1,Y1,Omega2,X2,Y2,EcBSE(ispin))
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! call print_excitation('pp-BSE (N+2)',ispin,nVV,Omega1)
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! call print_excitation('pp-BSE (N-2)',ispin,nOO,Omega2)
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call print_transition_vectors_pp(.true.,nBas,nC,nO,nV,nR,nOO,nVV,dipole_int,Omega1,X1,Y1,Omega2,X2,Y2)
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deallocate(Omega1,X1,Y1,Omega2,X2,Y2,WB,WC,WD)
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end if
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!-------------------
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! Triplet manifold
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!-------------------
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if(triplet) then
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ispin = 2
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EcBSE(ispin) = 0d0
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nOO = nO*(nO-1)/2
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nVV = nV*(nV-1)/2
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allocate(Omega1(nVV),X1(nVV,nVV),Y1(nOO,nVV), &
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Omega2(nOO),X2(nVV,nOO),Y2(nOO,nOO), &
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WB(nVV,nOO),WC(nVV,nVV),WD(nOO,nOO))
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if(.not.TDA) call static_screening_WB_pp(ispin,eta,nBas,nC,nO,nV,nR,nS,nOO,nVV,1d0,ERI,OmRPA,rho_RPA,WB)
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call static_screening_WC_pp(ispin,eta,nBas,nC,nO,nV,nR,nS,nOO,nVV,1d0,ERI,OmRPA,rho_RPA,WC)
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call static_screening_WD_pp(ispin,eta,nBas,nC,nO,nV,nR,nS,nOO,nVV,1d0,ERI,OmRPA,rho_RPA,WD)
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! Compute BSE excitation energies
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call linear_response_pp_BSE(ispin,TDA,.true.,nBas,nC,nO,nV,nR,nOO,nVV,1d0,eGW,ERI,WB,WC,WD, &
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Omega1,X1,Y1,Omega2,X2,Y2,EcBSE(ispin))
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! call print_excitation('pp-BSE (N+2)',ispin,nVV,Omega1)
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! call print_excitation('pp-BSE (N-2)',ispin,nOO,Omega2)
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call print_transition_vectors_pp(.false.,nBas,nC,nO,nV,nR,nOO,nVV,dipole_int,Omega1,X1,Y1,Omega2,X2,Y2)
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deallocate(Omega1,X1,Y1,Omega2,X2,Y2,WB,WC,WD)
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end if
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end subroutine Bethe_Salpeter_pp
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