mirror of
https://github.com/pfloos/quack
synced 2024-12-24 21:33:45 +01:00
447 lines
14 KiB
Fortran
447 lines
14 KiB
Fortran
subroutine qsUGW(maxSCF,thresh,max_diis,doACFDT,exchange_kernel,doXBS,COHSEX,SOSEX,BSE,TDA_W,TDA, &
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G0W,GW0,dBSE,dTDA,evDyn,spin_conserved,spin_flip,eta,nNuc,ZNuc,rNuc,ENuc,nBas,nC,nO, &
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nV,nR,nS,EUHF,S,X,T,V,Hc,ERI_AO,ERI_aaaa,ERI_aabb,ERI_bbbb,dipole_int_AO,dipole_int_aa, &
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dipole_int_bb,PHF,cHF,eHF)
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! Perform a quasiparticle self-consistent GW calculation
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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) :: maxSCF
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integer,intent(in) :: max_diis
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double precision,intent(in) :: thresh
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logical,intent(in) :: doACFDT
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logical,intent(in) :: exchange_kernel
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logical,intent(in) :: doXBS
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logical,intent(in) :: COHSEX
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logical,intent(in) :: SOSEX
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logical,intent(in) :: BSE
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logical,intent(in) :: TDA_W
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logical,intent(in) :: TDA
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logical,intent(in) :: dBSE
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logical,intent(in) :: dTDA
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logical,intent(in) :: evDyn
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logical,intent(in) :: G0W
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logical,intent(in) :: GW0
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logical,intent(in) :: spin_conserved
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logical,intent(in) :: spin_flip
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double precision,intent(in) :: eta
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integer,intent(in) :: nNuc
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double precision,intent(in) :: ZNuc(nNuc)
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double precision,intent(in) :: rNuc(nNuc,ncart)
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double precision,intent(in) :: ENuc
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integer,intent(in) :: nBas
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integer,intent(in) :: nC(nspin)
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integer,intent(in) :: nO(nspin)
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integer,intent(in) :: nV(nspin)
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integer,intent(in) :: nR(nspin)
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integer,intent(in) :: nS(nspin)
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double precision,intent(in) :: EUHF
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double precision,intent(in) :: eHF(nBas,nspin)
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double precision,intent(in) :: cHF(nBas,nBas,nspin)
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double precision,intent(in) :: PHF(nBas,nBas,nspin)
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double precision,intent(in) :: S(nBas,nBas)
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double precision,intent(in) :: T(nBas,nBas)
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double precision,intent(in) :: V(nBas,nBas)
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double precision,intent(in) :: Hc(nBas,nBas)
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double precision,intent(in) :: X(nBas,nBas)
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double precision,intent(in) :: ERI_AO(nBas,nBas,nBas,nBas)
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double precision,intent(inout):: ERI_aaaa(nBas,nBas,nBas,nBas)
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double precision,intent(inout):: ERI_aabb(nBas,nBas,nBas,nBas)
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double precision,intent(inout):: ERI_bbbb(nBas,nBas,nBas,nBas)
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double precision,intent(in) :: dipole_int_AO(nBas,nBas,ncart)
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double precision,intent(in) :: dipole_int_aa(nBas,nBas,ncart)
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double precision,intent(in) :: dipole_int_bb(nBas,nBas,ncart)
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! Local variables
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logical :: doGWPT = .false.
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integer :: nSCF
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integer :: nBasSq
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integer :: ispin
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integer :: is
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integer :: n_diis
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integer :: nS_aa,nS_bb,nS_sc
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double precision :: dipole(ncart)
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double precision :: ET(nspin)
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double precision :: EV(nspin)
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double precision :: EJ(nsp)
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double precision :: Ex(nspin)
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double precision :: EcRPA
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double precision :: EcGM(nspin)
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double precision :: EqsGW
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double precision :: EcBSE(nspin)
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double precision :: EcAC(nspin)
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double precision :: Conv
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double precision :: rcond(nspin)
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double precision,external :: trace_matrix
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double precision,allocatable :: error_diis(:,:,:)
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double precision,allocatable :: F_diis(:,:,:)
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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 :: c(:,:,:)
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double precision,allocatable :: cp(:,:,:)
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double precision,allocatable :: eGW(:,:)
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double precision,allocatable :: eOld(:,:)
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double precision,allocatable :: P(:,:,:)
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double precision,allocatable :: F(:,:,:)
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double precision,allocatable :: Fp(:,:,:)
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double precision,allocatable :: J(:,:,:)
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double precision,allocatable :: K(:,:,:)
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double precision,allocatable :: SigC(:,:,:)
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double precision,allocatable :: SigCp(:,:,:)
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double precision,allocatable :: SigCm(:,:,:)
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double precision,allocatable :: Z(:,:)
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double precision,allocatable :: error(:,:,:)
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! Hello world
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write(*,*)
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write(*,*)'*************************************************'
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write(*,*)'| Self-consistent unrestricted qsGW calculation |'
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write(*,*)'*************************************************'
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write(*,*)
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! Warning
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write(*,*) '!! ERIs in MO basis will be overwritten in qsUGW !!'
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write(*,*)
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! Stuff
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nBasSq = nBas*nBas
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! SOSEX correction
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if(SOSEX) then
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write(*,*) 'SOSEX correction activated but BUG!'
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stop
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end if
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! COHSEX approximation
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if(COHSEX) then
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write(*,*) 'COHSEX approximation activated!'
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write(*,*)
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end if
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! TDA for W
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if(TDA_W) then
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write(*,*) 'Tamm-Dancoff approximation for dynamic screening!'
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write(*,*)
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end if
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! TDA
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if(TDA) then
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write(*,*) 'Tamm-Dancoff approximation activated!'
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write(*,*)
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end if
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! Memory allocation
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nS_aa = nS(1)
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nS_bb = nS(2)
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nS_sc = nS_aa + nS_bb
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allocate(eGW(nBas,nspin),eOld(nBas,nspin),c(nBas,nBas,nspin),cp(nBas,nBas,nspin),P(nBas,nBas,nspin),F(nBas,nBas,nspin), &
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Fp(nBas,nBas,nspin),J(nBas,nBas,nspin),K(nBas,nBas,nspin),SigC(nBas,nBas,nspin),SigCp(nBas,nBas,nspin), &
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SigCm(nBas,nBas,nspin),Z(nBas,nspin),OmRPA(nS_sc),XpY_RPA(nS_sc,nS_sc),XmY_RPA(nS_sc,nS_sc), &
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rho_RPA(nBas,nBas,nS_sc,nspin),error(nBas,nBas,nspin),error_diis(nBasSq,max_diis,nspin), &
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F_diis(nBasSq,max_diis,nspin))
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! Initialization
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nSCF = -1
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n_diis = 0
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ispin = 1
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Conv = 1d0
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P(:,:,:) = PHF(:,:,:)
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eGW(:,:) = eHF(:,:)
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eOld(:,:) = eHF(:,:)
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c(:,:,:) = cHF(:,:,:)
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F_diis(:,:,:) = 0d0
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error_diis(:,:,:) = 0d0
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rcond = 1d0
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!------------------------------------------------------------------------
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! Main loop
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!------------------------------------------------------------------------
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do while(Conv > thresh .and. nSCF < maxSCF)
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! Increment
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nSCF = nSCF + 1
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! Buid Coulomb matrix
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do is=1,nspin
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call Coulomb_matrix_AO_basis(nBas,P(:,:,is),ERI_AO(:,:,:,:),J(:,:,is))
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end do
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! Compute exchange part of the self-energy
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do is=1,nspin
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call exchange_matrix_AO_basis(nBas,P(:,:,is),ERI_AO(:,:,:,:),K(:,:,is))
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end do
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!--------------------------------------------------
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! AO to MO transformation of two-electron integrals
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!--------------------------------------------------
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! 4-index transform for (aa|aa) block
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call AOtoMO_integral_transform(1,1,1,1,nBas,c,ERI_AO,ERI_aaaa)
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! 4-index transform for (aa|bb) block
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call AOtoMO_integral_transform(1,1,2,2,nBas,c,ERI_AO,ERI_aabb)
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! 4-index transform for (bb|bb) block
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call AOtoMO_integral_transform(2,2,2,2,nBas,c,ERI_AO,ERI_bbbb)
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! Compute linear response
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if(.not. GW0 .or. nSCF == 0) then
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call unrestricted_linear_response(ispin,.true.,TDA_W,.false.,eta,nBas,nC,nO,nV,nR,nS_aa,nS_bb,nS_sc,nS_sc,1d0, &
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eGW,ERI_aaaa,ERI_aabb,ERI_bbbb,OmRPA,rho_RPA,EcRPA,OmRPA,XpY_RPA,XmY_RPA)
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endif
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!----------------------!
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! Excitation densities !
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!----------------------!
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call unrestricted_excitation_density(nBas,nC,nO,nR,nS_aa,nS_bb,nS_sc,ERI_aaaa,ERI_aabb,ERI_bbbb,XpY_RPA,rho_RPA)
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!------------------------------------------------!
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! Compute self-energy and renormalization factor !
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!------------------------------------------------!
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if(G0W) then
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call unrestricted_self_energy_correlation(eta,nBas,nC,nO,nV,nR,nS_sc,eHF,OmRPA,rho_RPA,SigC,EcGM)
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call unrestricted_renormalization_factor(eta,nBas,nC,nO,nV,nR,nS_sc,eHF,OmRPA,rho_RPA,Z)
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else
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call unrestricted_self_energy_correlation(eta,nBas,nC,nO,nV,nR,nS_sc,eGW,OmRPA,rho_RPA,SigC,EcGM)
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call unrestricted_renormalization_factor(eta,nBas,nC,nO,nV,nR,nS_sc,eGW,OmRPA,rho_RPA,Z)
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endif
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! Make correlation self-energy Hermitian and transform it back to AO basis
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do is=1,nspin
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SigCp(:,:,is) = 0.5d0*(SigC(:,:,is) + transpose(SigC(:,:,is)))
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SigCm(:,:,is) = 0.5d0*(SigC(:,:,is) - transpose(SigC(:,:,is)))
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end do
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do is=1,nspin
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call MOtoAO_transform(nBas,S,c(:,:,is),SigCp(:,:,is))
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end do
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! Solve the quasi-particle equation
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do is=1,nspin
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F(:,:,is) = Hc(:,:) + J(:,:,is) + J(:,:,mod(is,2)+1) + K(:,:,is) + SigCp(:,:,is)
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end do
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! Check convergence
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do is=1,nspin
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error(:,:,is) = matmul(F(:,:,is),matmul(P(:,:,is),S(:,:))) - matmul(matmul(S(:,:),P(:,:,is)),F(:,:,is))
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end do
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if(nSCF > 1) conv = maxval(abs(error(:,:,:)))
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! DIIS extrapolation
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n_diis = min(n_diis+1,max_diis)
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if(minval(rcond(:)) > 1d-7) then
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do is=1,nspin
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if(nO(is) > 1) call DIIS_extrapolation(rcond(is),nBasSq,nBasSq,n_diis,error_diis(:,1:n_diis,is), &
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F_diis(:,1:n_diis,is),error(:,:,is),F(:,:,is))
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end do
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else
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n_diis = 0
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end if
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! Transform Fock matrix in orthogonal basis
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do is=1,nspin
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Fp(:,:,is) = matmul(transpose(X(:,:)),matmul(F(:,:,is),X(:,:)))
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end do
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! Diagonalize Fock matrix to get eigenvectors and eigenvalues
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cp(:,:,:) = Fp(:,:,:)
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do is=1,nspin
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call diagonalize_matrix(nBas,cp(:,:,is),eGW(:,is))
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end do
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! Back-transform eigenvectors in non-orthogonal basis
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do is=1,nspin
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c(:,:,is) = matmul(X(:,:),cp(:,:,is))
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end do
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! Back-transform self-energy
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do is=1,nspin
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SigCp(:,:,is) = matmul(transpose(c(:,:,is)),matmul(SigCp(:,:,is),c(:,:,is)))
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end do
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! Compute density matrix
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do is=1,nspin
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P(:,:,is) = matmul(c(:,1:nO(is),is),transpose(c(:,1:nO(is),is)))
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end do
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! Save quasiparticles energy for next cycle
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Conv = maxval(abs(eGW(:,:) - eOld(:,:)))
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eOld(:,:) = eGW(:,:)
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!------------------------------------------------------------------------
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! Compute total energy
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!------------------------------------------------------------------------
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! Kinetic energy
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do is=1,nspin
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ET(is) = trace_matrix(nBas,matmul(P(:,:,is),T(:,:)))
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end do
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! Potential energy
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do is=1,nspin
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EV(is) = trace_matrix(nBas,matmul(P(:,:,is),V(:,:)))
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end do
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! Coulomb energy
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EJ(1) = 0.5d0*trace_matrix(nBas,matmul(P(:,:,1),J(:,:,1)))
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EJ(2) = 0.5d0*trace_matrix(nBas,matmul(P(:,:,1),J(:,:,2))) &
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+ 0.5d0*trace_matrix(nBas,matmul(P(:,:,2),J(:,:,1)))
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EJ(3) = 0.5d0*trace_matrix(nBas,matmul(P(:,:,2),J(:,:,2)))
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! Exchange energy
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do is=1,nspin
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Ex(is) = 0.5d0*trace_matrix(nBas,matmul(P(:,:,is),K(:,:,is)))
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end do
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! Total energy
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EqsGW = sum(ET(:)) + sum(EV(:)) + sum(EJ(:)) + sum(Ex(:))
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!------------------------------------------------------------------------
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! Print results
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!------------------------------------------------------------------------
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call dipole_moment(nBas,P(:,:,1)+P(:,:,2),nNuc,ZNuc,rNuc,dipole_int_AO,dipole)
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call print_qsUGW(nBas,nO,nSCF,Conv,thresh,eHF,eGW,c,P,S,T,V,J,K,ENuc,ET,EV,EJ,Ex,EcGM,EcRPA,EqsGW,SigCp,Z,dipole)
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enddo
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!------------------------------------------------------------------------
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! End main loop
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!------------------------------------------------------------------------
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! Compute second-order correction of the Hermitization error
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!if(doGWPT) call qsGW_PT(nBas,nC,nO,nV,nR,nS,eGW,SigCm)
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! Did it actually converge?
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if(nSCF == maxSCF) then
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write(*,*)
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write(*,*)'!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
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write(*,*)' Convergence failed '
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write(*,*)'!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
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write(*,*)
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stop
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endif
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! Deallocate memory
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deallocate(cp,P,F,Fp,J,K,SigC,SigCp,SigCm,Z,OmRPA,XpY_RPA,XmY_RPA,rho_RPA,error,error_diis,F_diis)
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! Perform BSE calculation
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if(BSE) then
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call unrestricted_Bethe_Salpeter(TDA_W,TDA,dBSE,dTDA,evDyn,spin_conserved,spin_flip,eta,nBas,nC,nO,nV,nR,nS, &
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S,ERI_aaaa,ERI_aabb,ERI_bbbb,dipole_int_aa,dipole_int_bb,c,eGW,eGW,EcBSE)
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if(exchange_kernel) then
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EcBSE(1) = 0.5d0*EcBSE(1)
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EcBSE(2) = 0.5d0*EcBSE(2)
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else
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EcBSE(2) = 0.0d0
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end if
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write(*,*)
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write(*,*)'-------------------------------------------------------------------------------'
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write(*,'(2X,A50,F20.10)') 'Tr@BSE@qsUGW correlation energy (spin-conserved) =',EcBSE(1)
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write(*,'(2X,A50,F20.10)') 'Tr@BSE@qsUGW correlation energy (spin-flip) =',EcBSE(2)
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write(*,'(2X,A50,F20.10)') 'Tr@BSE@qsUGW correlation energy =',EcBSE(1) + EcBSE(2)
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write(*,'(2X,A50,F20.10)') 'Tr@BSE@qsUGW total energy =',ENuc + EqsGW + EcBSE(1) + EcBSE(2)
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write(*,*)'-------------------------------------------------------------------------------'
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write(*,*)
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! Compute the BSE correlation energy via the adiabatic connection
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if(doACFDT) then
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write(*,*) '--------------------------------------------------------------'
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write(*,*) ' Adiabatic connection version of BSE@qsUGW correlation energy '
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write(*,*) '--------------------------------------------------------------'
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write(*,*)
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if(doXBS) then
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write(*,*) '*** scaled screening version (XBS) ***'
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write(*,*)
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end if
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call unrestricted_ACFDT(exchange_kernel,doXBS,.true.,TDA_W,TDA,BSE,spin_conserved,spin_flip, &
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eta,nBas,nC,nO,nV,nR,nS,ERI_aaaa,ERI_aabb,ERI_bbbb,eGW,eGW,EcAC)
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write(*,*)
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write(*,*)'-------------------------------------------------------------------------------'
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write(*,'(2X,A50,F20.10)') 'AC@BSE@qsUGW correlation energy (spin-conserved) =',EcAC(1)
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write(*,'(2X,A50,F20.10)') 'AC@BSE@qsUGW correlation energy (spin-flip) =',EcAC(2)
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write(*,'(2X,A50,F20.10)') 'AC@BSE@qsUGW correlation energy =',EcAC(1) + EcAC(2)
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write(*,'(2X,A50,F20.10)') 'AC@BSE@qsUGW total energy =',ENuc + EqsGW + EcAC(1) + EcAC(2)
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write(*,*)'-------------------------------------------------------------------------------'
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write(*,*)
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end if
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end if
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end subroutine qsUGW
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