mirror of https://github.com/pfloos/quack
161 lines
5.8 KiB
Fortran
161 lines
5.8 KiB
Fortran
subroutine URPA(TDA,doACFDT,exchange_kernel,spin_conserved,spin_flip,eta,nBas,nC,nO,nV,nR,nS,ENuc,EUHF, &
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ERI_aaaa,ERI_aabb,ERI_bbbb,dipole_int_aa,dipole_int_bb,e,c,S)
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! Perform random phase approximation calculation with exchange (aka TDHF) in the unrestricted formalism
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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) :: TDA
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logical,intent(in) :: doACFDT
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logical,intent(in) :: exchange_kernel
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logical,intent(in) :: spin_conserved
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logical,intent(in) :: spin_flip
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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) :: eta
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double precision,intent(in) :: ENuc
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double precision,intent(in) :: EUHF
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double precision,intent(in) :: e(nBas,nspin)
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double precision,intent(in) :: c(nBas,nBas,nspin)
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double precision,intent(in) :: S(nBas,nBas)
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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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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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integer :: ispin
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integer :: nS_aa,nS_bb,nS_sc
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double precision,allocatable :: Omega_sc(:)
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double precision,allocatable :: XpY_sc(:,:)
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double precision,allocatable :: XmY_sc(:,:)
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integer :: nS_ab,nS_ba,nS_sf
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double precision,allocatable :: Omega_sf(:)
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double precision,allocatable :: XpY_sf(:,:)
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double precision,allocatable :: XmY_sf(:,:)
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double precision :: rho_sc,rho_sf
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double precision :: EcRPA(nspin)
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double precision :: EcAC(nspin)
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! Hello world
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write(*,*)
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write(*,*)'**************************************************************'
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write(*,*)'| Unrestricted direct random phase approximation calculation |'
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write(*,*)'**************************************************************'
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write(*,*)
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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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! Initialization
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EcRPA(:) = 0d0
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EcAC(:) = 0d0
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! Spin-conserved transitions
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if(spin_conserved) then
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ispin = 1
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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(Omega_sc(nS_sc),XpY_sc(nS_sc,nS_sc),XmY_sc(nS_sc,nS_sc))
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call unrestricted_linear_response(ispin,.true.,TDA,.false.,eta,nBas,nC,nO,nV,nR,nS_aa,nS_bb,nS_sc,nS_sc,1d0,e, &
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ERI_aaaa,ERI_aabb,ERI_bbbb,Omega_sc,rho_sc,EcRPA(ispin),Omega_sc,XpY_sc,XmY_sc)
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call print_excitation('URPA ',5,nS_sc,Omega_sc)
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call print_unrestricted_transition_vectors(ispin,nBas,nC,nO,nV,nR,nS,nS_aa,nS_bb,nS_sc,dipole_int_aa,dipole_int_bb, &
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c,S,Omega_sc,XpY_sc,XmY_sc)
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deallocate(Omega_sc,XpY_sc,XmY_sc)
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endif
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! Spin-flip transitions
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if(spin_flip) then
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ispin = 2
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! Memory allocation
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nS_ab = (nO(1) - nC(1))*(nV(2) - nR(2))
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nS_ba = (nO(2) - nC(2))*(nV(1) - nR(1))
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nS_sf = nS_ab + nS_ba
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allocate(Omega_sf(nS_sf),XpY_sf(nS_sf,nS_sf),XmY_sf(nS_sf,nS_sf))
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call unrestricted_linear_response(ispin,.true.,TDA,.false.,eta,nBas,nC,nO,nV,nR,nS_ab,nS_ba,nS_sf,nS_sf,1d0,e, &
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ERI_aaaa,ERI_aabb,ERI_bbbb,Omega_sf,rho_sf,EcRPA(ispin),Omega_sf,XpY_sf,XmY_sf)
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call print_excitation('URPA ',6,nS_sf,Omega_sf)
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call print_unrestricted_transition_vectors(ispin,nBas,nC,nO,nV,nR,nS,nS_ab,nS_ba,nS_sf,dipole_int_aa,dipole_int_bb, &
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c,S,Omega_sf,XpY_sf,XmY_sf)
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deallocate(Omega_sf,XpY_sf,XmY_sf)
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endif
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if(exchange_kernel) then
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EcRPA(1) = 0.5d0*EcRPA(1)
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EcRPA(2) = 1.5d0*EcRPA(2)
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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@URPA correlation energy (spin-conserved) =',EcRPA(1)
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write(*,'(2X,A50,F20.10)') 'Tr@URPA correlation energy (spin-flip) =',EcRPA(2)
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write(*,'(2X,A50,F20.10)') 'Tr@URPA correlation energy =',EcRPA(1) + EcRPA(2)
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write(*,'(2X,A50,F20.10)') 'Tr@URPA total energy =',ENuc + EUHF + EcRPA(1) + EcRPA(2)
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write(*,*)'-------------------------------------------------------------------------------'
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write(*,*)
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! Compute the 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 URPA correlation energy '
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write(*,*) '---------------------------------------------------------'
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write(*,*)
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call unrestricted_ACFDT(exchange_kernel,.false.,.true.,.false.,TDA,.false.,spin_conserved,spin_flip,eta, &
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nBas,nC,nO,nV,nR,nS,ERI_aaaa,ERI_aabb,ERI_bbbb,e,e,EcAC)
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write(*,*)
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write(*,*)'-------------------------------------------------------------------------------'
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write(*,'(2X,A50,F20.10)') 'AC@URPA correlation energy (spin-conserved) =',EcAC(1)
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write(*,'(2X,A50,F20.10)') 'AC@URPA correlation energy (spin-flip) =',EcAC(2)
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write(*,'(2X,A50,F20.10)') 'AC@URPA correlation energy =',EcAC(1) + EcAC(2)
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write(*,'(2X,A50,F20.10)') 'AC@URPA total energy =',ENuc + EUHF + 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 subroutine URPA
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