mirror of
https://github.com/LCPQ/quantum_package
synced 2024-06-26 07:02:14 +02:00
222 lines
6.4 KiB
Fortran
222 lines
6.4 KiB
Fortran
subroutine get_s2(key_i,key_j,s2,Nint)
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implicit none
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use bitmasks
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BEGIN_DOC
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! Returns <S^2>
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END_DOC
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integer, intent(in) :: Nint
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integer(bit_kind), intent(in) :: key_i(Nint,2)
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integer(bit_kind), intent(in) :: key_j(Nint,2)
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double precision, intent(out) :: s2
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integer :: exc(0:2,2,2)
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integer :: degree
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double precision :: phase_spsm
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integer :: nup, i
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s2 = 0.d0
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!$FORCEINLINE
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call get_excitation_degree(key_i,key_j,degree,Nint)
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select case (degree)
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case(2)
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call get_double_excitation(key_j,key_i,exc,phase_spsm,Nint)
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if (exc(0,1,1) == 1) then ! Mono alpha + mono-beta
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if ( (exc(1,1,1) == exc(1,2,2)).and.(exc(1,1,2) == exc(1,2,1)) ) then
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s2 = -phase_spsm
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endif
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endif
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case(0)
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nup = 0
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do i=1,Nint
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nup += popcnt(iand(xor(key_i(i,1),key_i(i,2)),key_i(i,1)))
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enddo
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s2 = dble(nup)
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end select
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end
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BEGIN_PROVIDER [ double precision, S_z ]
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&BEGIN_PROVIDER [ double precision, S_z2_Sz ]
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implicit none
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BEGIN_DOC
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! z component of the Spin
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END_DOC
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S_z = 0.5d0*dble(elec_alpha_num-elec_beta_num)
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S_z2_Sz = S_z*(S_z-1.d0)
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END_PROVIDER
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BEGIN_PROVIDER [ double precision, expected_s2]
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implicit none
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BEGIN_DOC
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! Expected value of S2 : S*(S+1)
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END_DOC
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logical :: has_expected_s2
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call ezfio_has_determinants_expected_s2(has_expected_s2)
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if (has_expected_s2) then
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call ezfio_get_determinants_expected_s2(expected_s2)
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else
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double precision :: S
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S = (elec_alpha_num-elec_beta_num)*0.5d0
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expected_s2 = S * (S+1.d0)
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! expected_s2 = elec_alpha_num - elec_beta_num + 0.5d0 * ((elec_alpha_num - elec_beta_num)**2*0.5d0 - (elec_alpha_num-elec_beta_num))
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endif
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END_PROVIDER
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BEGIN_PROVIDER [ double precision, s2_values, (N_states) ]
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implicit none
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BEGIN_DOC
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! array of the averaged values of the S^2 operator on the various states
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END_DOC
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integer :: i
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double precision :: s2
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do i = 1, N_states
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call get_s2_u0(psi_det,psi_coef(1,i),n_det,size(psi_coef,1),s2)
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s2_values(i) = s2
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enddo
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END_PROVIDER
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subroutine get_s2_u0_old(psi_keys_tmp,psi_coefs_tmp,n,nmax,s2)
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implicit none
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use bitmasks
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integer(bit_kind), intent(in) :: psi_keys_tmp(N_int,2,nmax)
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integer, intent(in) :: n,nmax
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double precision, intent(in) :: psi_coefs_tmp(nmax)
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double precision, intent(out) :: s2
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integer :: i,j,l
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double precision :: s2_tmp
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s2 = 0.d0
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!$OMP PARALLEL DO DEFAULT(NONE) &
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!$OMP PRIVATE(i,j,s2_tmp) SHARED(n,psi_coefs_tmp,psi_keys_tmp,N_int) REDUCTION(+:s2) SCHEDULE(dynamic)
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do i=1,n
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do j=i+1,n
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call get_s2(psi_keys_tmp(1,1,i),psi_keys_tmp(1,1,j),s2_tmp,N_int)
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s2 += psi_coefs_tmp(i)*psi_coefs_tmp(j)*s2_tmp
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enddo
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enddo
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!$OMP END PARALLEL DO
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s2 = s2+s2
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do i=1,n
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call get_s2(psi_keys_tmp(1,1,i),psi_keys_tmp(1,1,i),s2_tmp,N_int)
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s2 += psi_coefs_tmp(i)*psi_coefs_tmp(i)*s2_tmp
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enddo
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s2 += S_z2_Sz
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end
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subroutine get_s2_u0(psi_keys_tmp,psi_coefs_tmp,n,nmax,s2)
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implicit none
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use bitmasks
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integer(bit_kind), intent(in) :: psi_keys_tmp(N_int,2,nmax)
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integer, intent(in) :: n,nmax
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double precision, intent(in) :: psi_coefs_tmp(nmax)
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double precision, intent(out) :: s2
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double precision :: s2_tmp
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integer :: i,j,l,jj,ii
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integer, allocatable :: idx(:)
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integer(bit_kind) :: psi_keys_srt(N_int,2,n)
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integer :: shortcut(0:n+1), sort_idx(n), warp(2,0:n+1), ni, sh, tmp
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print *, "totolacitrouille"
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call write_time(6)
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psi_keys_srt(:,:,:) = psi_keys_tmp(:,:,:)
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call sort_dets_ab(psi_keys_srt, sort_idx, shortcut, n, N_int)
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print *, "totolacitrouille 2"
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s2 = 0.d0
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!$OMP PARALLEL DEFAULT(NONE) &
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!$OMP PRIVATE(i,j,s2_tmp,idx,warp,tmp) &
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!$OMP SHARED(n,psi_coefs_tmp,psi_keys_tmp,N_int,davidson_threshold,shortcut,psi_keys_srt,sort_idx)&
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!$OMP REDUCTION(+:s2)
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allocate(idx(0:n))
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!$OMP DO SCHEDULE(dynamic)
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do sh=1,shortcut(0)
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warp(1,0) = 0
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do ii=1,sh!shortcut(0)
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tmp = 0
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do ni=1,N_int
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tmp = popcnt(xor(psi_keys_tmp(ni,1, shortcut(ii)), psi_keys_tmp(ni,1,shortcut(sh))))
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end do
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if(tmp <= 4) then
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tmp = warp(1,0) + 1
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warp(1,0) = tmp
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warp(1,tmp) = shortcut(ii)
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warp(2,tmp) = shortcut(ii+1)-1
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end if
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end do
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do ii=shortcut(sh),shortcut(sh+1)-1
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!do ii=1,n
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idx(0) = ii
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call filter_connected_davidson_warp(psi_keys_srt,warp,psi_keys_srt(1,1,ii),N_int,ii-1,idx)
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i = sort_idx(ii)
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do jj=1,idx(0)
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j = sort_idx(idx(jj))
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if ( dabs(psi_coefs_tmp(j)) + dabs(psi_coefs_tmp(i)) &
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> davidson_threshold ) then
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call get_s2(psi_keys_srt(1,1,ii),psi_keys_srt(1,1,idx(jj)),s2_tmp,N_int)
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s2 = s2 + psi_coefs_tmp(i)*psi_coefs_tmp(j)*s2_tmp
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endif
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enddo
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end do
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enddo
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!$OMP END DO
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deallocate(idx)
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!$OMP END PARALLEL
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s2 = s2+s2
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do i=1,n
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call get_s2(psi_keys_srt(1,1,sort_idx(i)),psi_keys_srt(1,1,sort_idx(i)),s2_tmp,N_int)
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s2 = s2 + psi_coefs_tmp(i)*psi_coefs_tmp(i)*s2_tmp
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enddo
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s2 = s2 + S_z2_Sz
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print *, "totolacitrouille 3"
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call write_time(6)
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end
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!
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! subroutine get_s2_u0_org(psi_keys_tmp,psi_coefs_tmp,n,nmax,s2)
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! implicit none
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! use bitmasks
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! integer(bit_kind), intent(in) :: psi_keys_tmp(N_int,2,nmax)
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! integer, intent(in) :: n,nmax
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! double precision, intent(in) :: psi_coefs_tmp(nmax)
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! double precision, intent(out) :: s2
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! double precision :: s2_tmp
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! integer :: i,j,l,jj
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! integer, allocatable :: idx(:)
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! s2 = 0.d0
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! !$OMP PARALLEL DEFAULT(NONE) &
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! !$OMP PRIVATE(i,j,s2_tmp,idx) &
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! !$OMP SHARED(n,psi_coefs_tmp,psi_keys_tmp,N_int,davidson_threshold)&
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! !$OMP REDUCTION(+:s2)
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! allocate(idx(0:n))
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! !$OMP DO SCHEDULE(dynamic)
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! do i=1,n
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! idx(0) = i
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! call filter_connected_davidson(psi_keys_tmp,psi_keys_tmp(1,1,i),N_int,i-1,idx)
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! do jj=1,idx(0)
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! j = idx(jj)
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! if ( dabs(psi_coefs_tmp(j)) + dabs(psi_coefs_tmp(i)) &
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! > davidson_threshold ) then
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! call get_s2(psi_keys_tmp(1,1,i),psi_keys_tmp(1,1,j),s2_tmp,N_int)
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! s2 = s2 + psi_coefs_tmp(i)*psi_coefs_tmp(j)*s2_tmp
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! endif
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! enddo
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! enddo
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! !$OMP END DO
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! deallocate(idx)
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! !$OMP END PARALLEL
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! s2 = s2+s2
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! do i=1,n
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! call get_s2(psi_keys_tmp(1,1,i),psi_keys_tmp(1,1,i),s2_tmp,N_int)
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! s2 = s2 + psi_coefs_tmp(i)*psi_coefs_tmp(i)*s2_tmp
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! enddo
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! s2 = s2 + S_z2_Sz
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! end
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!
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