2020-09-28 22:58:58 +02:00
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subroutine UG0W0(doACFDT,exchange_kernel,doXBS,COHSEX,BSE,TDA_W,TDA,dBSE,dTDA,evDyn,spin_conserved,spin_flip, &
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2021-02-15 17:27:06 +01:00
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linearize,eta,nBas,nC,nO,nV,nR,nS,ENuc,EUHF,S,ERI,ERI_aaaa,ERI_aabb,ERI_bbbb, &
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dipole_int_aa,dipole_int_bb,PHF,cHF,eHF,Vxc,eGW)
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2020-09-21 23:04:26 +02:00
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! Perform unrestricted G0W0 calculation
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implicit none
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include 'parameters.h'
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include 'quadrature.h'
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! Input variables
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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) :: 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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2020-09-22 22:13:51 +02:00
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logical,intent(in) :: spin_conserved
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logical,intent(in) :: spin_flip
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2020-09-21 23:04:26 +02:00
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logical,intent(in) :: linearize
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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(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) :: ENuc
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double precision,intent(in) :: EUHF
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2020-10-06 14:24:54 +02:00
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double precision,intent(in) :: S(nBas,nBas)
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2021-02-15 17:27:06 +01:00
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double precision,intent(in) :: ERI(nBas,nBas,nBas,nBas)
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2020-09-22 22:13:51 +02:00
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double precision,intent(in) :: ERI_aaaa(nBas,nBas,nBas,nBas)
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double precision,intent(in) :: ERI_aabb(nBas,nBas,nBas,nBas)
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double precision,intent(in) :: ERI_bbbb(nBas,nBas,nBas,nBas)
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2020-09-28 22:58:58 +02:00
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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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2020-10-06 14:24:54 +02:00
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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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2021-02-15 17:27:06 +01:00
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double precision,intent(in) :: Vxc(nBas,nspin)
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2020-09-21 23:04:26 +02:00
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! Local variables
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logical :: print_W = .true.
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2020-09-23 14:23:40 +02:00
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integer :: is
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2020-09-21 23:04:26 +02:00
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integer :: ispin
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2020-09-24 14:39:37 +02:00
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double precision :: EcRPA
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2020-11-04 14:47:45 +01:00
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double precision :: EcGM(nspin)
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2020-09-22 23:08:47 +02:00
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double precision :: EcBSE(nspin)
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2020-09-21 23:04:26 +02:00
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double precision :: EcAC(nspin)
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2021-02-15 17:27:06 +01:00
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double precision,allocatable :: SigX(:,:)
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2020-09-21 23:04:26 +02:00
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double precision,allocatable :: SigC(:,:)
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double precision,allocatable :: Z(:,:)
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2020-09-22 23:08:47 +02:00
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integer :: nS_aa,nS_bb,nS_sc
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2020-09-24 14:39:37 +02:00
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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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2020-09-21 23:04:26 +02:00
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double precision,allocatable :: eGWlin(:,:)
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! Output variables
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double precision :: eGW(nBas,nspin)
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! Hello world
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write(*,*)
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write(*,*)'************************************************'
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write(*,*)'| One-shot G0W0 calculation |'
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write(*,*)'| *** Unrestricted version *** |'
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write(*,*)'************************************************'
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write(*,*)
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! Initialization
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2020-09-22 15:32:26 +02:00
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EcRPA = 0d0
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2020-09-21 23:04:26 +02:00
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! COHSEX approximation
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2020-09-22 22:13:51 +02:00
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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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2020-09-21 23:04:26 +02:00
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! TDA for W
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2020-09-22 22:13:51 +02:00
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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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2020-09-21 23:04:26 +02:00
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! TDA
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2020-09-22 22:13:51 +02:00
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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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2020-09-21 23:04:26 +02:00
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! Memory allocation
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2020-09-22 23:08:47 +02:00
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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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2020-09-21 23:04:26 +02:00
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2021-02-15 17:27:06 +01:00
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allocate(SigX(nBas,nspin),SigC(nBas,nspin),Z(nBas,nspin),eGWlin(nBas,nspin), &
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OmRPA(nS_sc),XpY_RPA(nS_sc,nS_sc),XmY_RPA(nS_sc,nS_sc),rho_RPA(nBas,nBas,nS_sc,nspin))
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2020-09-21 23:04:26 +02:00
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2020-09-22 15:32:26 +02:00
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!-------------------!
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! Compute screening !
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!-------------------!
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2020-09-21 23:04:26 +02:00
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2020-09-22 15:32:26 +02:00
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! Spin-conserving transition
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2020-09-21 23:04:26 +02:00
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2020-09-22 15:32:26 +02:00
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ispin = 1
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2020-09-21 23:04:26 +02:00
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2020-09-23 22:48:54 +02:00
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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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2020-10-05 23:00:56 +02:00
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eHF,ERI_aaaa,ERI_aabb,ERI_bbbb,OmRPA,rho_RPA,EcRPA,OmRPA,XpY_RPA,XmY_RPA)
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2020-09-21 23:04:26 +02:00
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2020-09-25 15:05:06 +02:00
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if(print_W) call print_excitation('RPA@UHF ',5,nS_sc,OmRPA)
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2020-09-21 23:04:26 +02:00
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2020-09-22 15:32:26 +02:00
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!----------------------!
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! Excitation densities !
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!----------------------!
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2020-09-21 23:04:26 +02:00
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2020-09-24 14:39:37 +02:00
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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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2020-09-21 23:04:26 +02:00
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2020-09-22 15:32:26 +02:00
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!---------------------!
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! Compute self-energy !
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!---------------------!
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2020-09-21 23:04:26 +02:00
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2021-02-15 17:27:06 +01:00
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do is=1,nspin
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call self_energy_exchange_diag(nBas,cHF(:,:,is),PHF(:,:,is),ERI,SigX(:,is))
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end do
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2020-11-04 14:47:45 +01:00
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call unrestricted_self_energy_correlation_diag(eta,nBas,nC,nO,nV,nR,nS_sc,eHF,OmRPA,rho_RPA,SigC,EcGM)
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2020-09-21 23:04:26 +02:00
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2020-09-22 15:32:26 +02:00
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!--------------------------------!
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! Compute renormalization factor !
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!--------------------------------!
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2020-09-21 23:04:26 +02:00
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2020-09-24 14:39:37 +02:00
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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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2020-09-21 23:04:26 +02:00
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2020-09-22 15:32:26 +02:00
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!-----------------------------------!
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! Solve the quasi-particle equation !
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!-----------------------------------!
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2021-02-15 17:27:06 +01:00
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eGWlin(:,:) = eHF(:,:) + Z(:,:)*(SigX(:,:) + SigC(:,:) - Vxc(:,:))
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2020-09-21 23:04:26 +02:00
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if(linearize) then
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write(*,*) ' *** Quasiparticle energies obtained by linearization *** '
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write(*,*)
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eGW(:,:) = eGWlin(:,:)
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else
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! Find graphical solution of the QP equation
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2021-02-15 17:27:06 +01:00
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do is=1,nspin
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2021-02-15 22:15:30 +01:00
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call unrestricted_QP_graph(nBas,nC(is),nO(is),nV(is),nR(is),nS_sc,eta,eHF(:,is),SigX(:,is),Vxc(:,is), &
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OmRPA,rho_RPA(:,:,:,is),eGWlin(:,is),eGW(:,is))
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2021-02-15 17:27:06 +01:00
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end do
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2020-09-21 23:04:26 +02:00
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end if
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2020-09-24 14:39:37 +02:00
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! Compute RPA correlation energy
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2020-09-21 23:04:26 +02:00
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2020-09-23 22:48:54 +02:00
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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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2020-10-05 23:00:56 +02:00
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eGW,ERI_aaaa,ERI_aabb,ERI_bbbb,OmRPA,rho_RPA,EcRPA,OmRPA,XpY_RPA,XmY_RPA)
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2020-09-21 23:04:26 +02:00
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2020-09-24 14:39:37 +02:00
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! Dump results
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2020-11-04 14:47:45 +01:00
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call print_UG0W0(nBas,nO,eHF,ENuc,EUHF,SigC,Z,eGW,EcRPA,EcGM)
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2020-09-21 23:04:26 +02:00
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2020-09-22 23:08:47 +02:00
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! Free memory
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2020-09-24 14:39:37 +02:00
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deallocate(OmRPA,XpY_RPA,XmY_RPA,rho_RPA)
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2020-09-22 23:08:47 +02:00
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2020-09-21 23:04:26 +02:00
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! Perform BSE calculation
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2020-09-22 22:13:51 +02:00
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if(BSE) then
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2020-09-21 23:04:26 +02:00
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2020-10-06 14:24:54 +02:00
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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,S, &
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ERI_aaaa,ERI_aabb,ERI_bbbb,dipole_int_aa,dipole_int_bb,cHF,eHF,eGW,EcBSE)
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2020-09-21 23:04:26 +02:00
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2020-10-07 18:26:24 +02:00
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if(exchange_kernel) then
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EcBSE(1) = 0.5d0*EcBSE(1)
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EcBSE(2) = 1.5d0*EcBSE(1)
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end if
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2020-09-21 23:04:26 +02:00
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2020-10-07 18:26:24 +02:00
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write(*,*)
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write(*,*)'-------------------------------------------------------------------------------'
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2020-10-07 22:51:30 +02:00
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write(*,'(2X,A50,F20.10)') 'Tr@BSE@UG0W0 correlation energy (spin-conserved) =',EcBSE(1)
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write(*,'(2X,A50,F20.10)') 'Tr@BSE@UG0W0 correlation energy (spin-flip) =',EcBSE(2)
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write(*,'(2X,A50,F20.10)') 'Tr@BSE@UG0W0 correlation energy =',EcBSE(1) + EcBSE(2)
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write(*,'(2X,A50,F20.10)') 'Tr@BSE@UG0W0 total energy =',ENuc + EUHF + EcBSE(1) + EcBSE(2)
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2020-10-07 18:26:24 +02:00
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write(*,*)'-------------------------------------------------------------------------------'
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write(*,*)
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2020-09-21 23:04:26 +02:00
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2020-10-07 18:26:24 +02:00
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! Compute the BSE correlation energy via the adiabatic connection
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2020-09-21 23:04:26 +02:00
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2020-10-07 18:26:24 +02:00
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if(doACFDT) then
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2020-09-21 23:04:26 +02:00
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2020-10-07 18:26:24 +02:00
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write(*,*) '------------------------------------------------------'
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write(*,*) 'Adiabatic connection version of BSE correlation energy'
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write(*,*) '------------------------------------------------------'
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write(*,*)
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2020-09-21 23:04:26 +02:00
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2020-10-07 18:26:24 +02:00
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if(doXBS) then
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2020-09-21 23:04:26 +02:00
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2020-10-07 18:26:24 +02:00
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write(*,*) '*** scaled screening version (XBS) ***'
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write(*,*)
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2020-09-21 23:04:26 +02:00
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2020-10-07 18:26:24 +02:00
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end if
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2020-09-21 23:04:26 +02:00
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2020-10-07 22:51:30 +02:00
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call unrestricted_ACFDT(exchange_kernel,doXBS,.true.,TDA_W,TDA,BSE,spin_conserved,spin_flip,eta, &
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nBas,nC,nO,nV,nR,nS,ERI_aaaa,ERI_aabb,ERI_bbbb,eHF,eGW,EcAC)
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2020-10-07 18:26:24 +02:00
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write(*,*)
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write(*,*)'-------------------------------------------------------------------------------'
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2020-10-07 22:51:30 +02:00
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write(*,'(2X,A50,F20.10)') 'AC@BSE@UG0W0 correlation energy (spin-conserved) =',EcAC(1)
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write(*,'(2X,A50,F20.10)') 'AC@BSE@UG0W0 correlation energy (spin-flip) =',EcAC(2)
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write(*,'(2X,A50,F20.10)') 'AC@BSE@UG0W0 correlation energy =',EcAC(1) + EcAC(2)
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write(*,'(2X,A50,F20.10)') 'AC@BSE@UG0W0 total energy =',ENuc + EUHF + EcAC(1) + EcAC(2)
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2020-10-07 18:26:24 +02:00
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write(*,*)'-------------------------------------------------------------------------------'
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write(*,*)
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end if
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2020-09-21 23:04:26 +02:00
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2020-09-22 22:13:51 +02:00
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end if
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2020-09-21 23:04:26 +02:00
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end subroutine UG0W0
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