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quantum_package/plugins/MRCC_Utils/mrcc_utils.irp.f

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BEGIN_PROVIDER [integer, pert_determinants, (N_states, psi_det_size) ]
END_PROVIDER
BEGIN_PROVIDER [ double precision, lambda_mrcc, (N_states,psi_det_size) ]
&BEGIN_PROVIDER [ double precision, lambda_pert, (N_states,psi_det_size) ]
implicit none
BEGIN_DOC
! cm/<Psi_0|H|D_m> or perturbative 1/Delta_E(m)
END_DOC
integer :: i,k,j
double precision :: ihpsi(N_states), hii,delta_e_eff,ihpsi_current(N_states),hij
integer :: i_ok,i_pert,i_pert_count
i_ok = 0
double precision :: phase_restart(N_states),tmp
do k = 1, N_states
phase_restart(k) = dsign(1.d0,psi_ref_coef_restart(1,k)/psi_ref_coef(1,k))
enddo
i_pert_count = 0
do i=1,N_det_non_ref
call i_h_psi(psi_non_ref(1,1,i), psi_ref_restart, psi_ref_coef_restart, N_int, N_det_ref,&
size(psi_ref_coef_restart,1), n_states, ihpsi)
call i_H_j(psi_non_ref(1,1,i),psi_non_ref(1,1,i),N_int,hii)
! TODO --- Test perturbatif ------
do k=1,N_states
lambda_pert(k,i) = 1.d0 / (psi_ref_energy_diagonalized(k)-hii)
! TODO : i_h_psi peut sortir de la boucle?
call i_h_psi(psi_non_ref(1,1,i), psi_ref, psi_ref_coef, N_int, N_det_ref,size(psi_ref_coef,1), n_states, ihpsi_current)
if (ihpsi_current(k) == 0.d0) then
ihpsi_current(k) = 1.d-32
endif
tmp = psi_non_ref_coef(i,k)/ihpsi_current(k)
i_pert = 0
! Perturbation only if 1st order < 0.5 x second order
if((ihpsi(k) * lambda_pert(k,i)) < 0.5d0 * psi_non_ref_coef_restart(i,k) )then
i_pert = 1
else
do j = 1, N_det_ref
call i_H_j(psi_non_ref(1,1,i),psi_ref(1,1,j),N_int,hij)
! Perturbation diverges when hij*tmp > 0.5
if(dabs(hij * tmp).ge.0.5d0)then
i_pert_count +=1
i_pert = 1
exit
endif
enddo
endif
if( i_pert == 1)then
pert_determinants(k,i) = i_pert
endif
if(pert_determinants(k,i) == 1)then
i_ok +=1
lambda_mrcc(k,i) = lambda_pert(k,i)
else
lambda_mrcc(k,i) = psi_non_ref_coef(i,k)/ihpsi_current(k)
endif
enddo
! TODO --- Fin test perturbatif ------
enddo
!if(oscillations)then
! print*,'AVERAGING the lambda_mrcc with those of the previous iterations'
! do i = 1, N_det_non_ref
! do k = 1, N_states
! double precision :: tmp
! tmp = lambda_mrcc(k,i)
! lambda_mrcc(k,i) += lambda_mrcc_tmp(k,i)
! lambda_mrcc(k,i) = lambda_mrcc(k,i) * 0.5d0
! if(dabs(tmp - lambda_mrcc(k,i)).ge.1.d-9)then
! print*,''
! print*,'i = ',i
! print*,'psi_non_ref_coef(i,k) = ',psi_non_ref_coef(i,k)
! print*,'lambda_mrcc(k,i) = ',lambda_mrcc(k,i)
! print*,' tmp = ',tmp
! endif
! enddo
! enddo
!endif
print*,'N_det_non_ref = ',N_det_non_ref
print*,'Number of Perturbatively treated determinants = ',i_ok
print*,'i_pert_count = ',i_pert_count
print*,'psi_coef_ref_ratio = ',psi_ref_coef(2,1)/psi_ref_coef(1,1)
END_PROVIDER
BEGIN_PROVIDER [ double precision, lambda_mrcc_tmp, (N_states,psi_det_size) ]
implicit none
lambda_mrcc_tmp = 0.d0
END_PROVIDER
BEGIN_PROVIDER [ logical, oscillations ]
implicit none
oscillations = .False.
END_PROVIDER
!BEGIN_PROVIDER [ double precision, delta_ij_non_ref, (N_det_non_ref, N_det_non_ref,N_states) ]
!implicit none
!BEGIN_DOC
!! Dressing matrix in SD basis
!END_DOC
!delta_ij_non_ref = 0.d0
!call H_apply_mrcc_simple(delta_ij_non_ref,N_det_non_ref)
!END_PROVIDER
BEGIN_PROVIDER [ double precision, delta_ij, (N_det_ref,N_det_non_ref,N_states) ]
&BEGIN_PROVIDER [ double precision, delta_ii, (N_det_ref,N_states) ]
implicit none
BEGIN_DOC
! Dressing matrix in N_det basis
END_DOC
integer :: i,j,m
delta_ij = 0.d0
delta_ii = 0.d0
call H_apply_mrcc(delta_ij,delta_ii,N_det_ref,N_det_non_ref)
double precision :: max_delta
double precision :: accu
integer :: imax,jmax
max_delta = 0.d0
accu = 0.d0
do i = 1, N_det_ref
do j = 1, N_det_non_ref
accu += psi_non_ref_coef(j,1) * psi_ref_coef(i,1) * delta_ij(i,j,1)
if(dabs(delta_ij(i,j,1)).gt.max_delta)then
max_delta = dabs(delta_ij(i,j,1))
imax = i
jmax = j
endif
enddo
enddo
print*,''
print*,''
print*,'<psi| Delta H |psi> = ',accu
print*,'MAX VAL OF DRESING = ',delta_ij(imax,jmax,1)
print*,'imax,jmax = ',imax,jmax
print*,'psi_ref_coef(imax,1) = ',psi_ref_coef(imax,1)
print*,'psi_non_ref_coef(jmax,1) = ',psi_non_ref_coef(jmax,1)
do i = 1, N_det_ref
print*,'delta_ii(i,1) = ',delta_ii(i,1)
enddo
END_PROVIDER
BEGIN_PROVIDER [ double precision, h_matrix_dressed, (N_det,N_det,N_states) ]
implicit none
BEGIN_DOC
! Dressed H with Delta_ij
END_DOC
integer :: i, j,istate,ii,jj
do istate = 1,N_states
do j=1,N_det
do i=1,N_det
h_matrix_dressed(i,j,istate) = h_matrix_all_dets(i,j)
enddo
enddo
do ii = 1, N_det_ref
i =idx_ref(ii)
h_matrix_dressed(i,i,istate) += delta_ii(ii,istate)
do jj = 1, N_det_non_ref
j =idx_non_ref(jj)
h_matrix_dressed(i,j,istate) += delta_ij(ii,jj,istate)
h_matrix_dressed(j,i,istate) += delta_ij(ii,jj,istate)
enddo
enddo
enddo
END_PROVIDER
BEGIN_PROVIDER [ double precision, CI_electronic_energy_dressed, (N_states_diag) ]
&BEGIN_PROVIDER [ double precision, CI_eigenvectors_dressed, (N_det,N_states_diag) ]
&BEGIN_PROVIDER [ double precision, CI_eigenvectors_s2_dressed, (N_states_diag) ]
implicit none
BEGIN_DOC
! Eigenvectors/values of the CI matrix
END_DOC
integer :: i,j
do j=1,N_states_diag
do i=1,N_det
CI_eigenvectors_dressed(i,j) = psi_coef(i,j)
enddo
enddo
if (diag_algorithm == "Davidson") then
integer :: istate
istate = 1
call davidson_diag_mrcc(psi_det,CI_eigenvectors_dressed,CI_electronic_energy_dressed,&
size(CI_eigenvectors_dressed,1),N_det,N_states_diag,N_int,output_determinants,istate)
else if (diag_algorithm == "Lapack") then
double precision, allocatable :: eigenvectors(:,:), eigenvalues(:)
allocate (eigenvectors(size(H_matrix_dressed,1),N_det))
allocate (eigenvalues(N_det))
call lapack_diag(eigenvalues,eigenvectors, &
H_matrix_dressed,size(H_matrix_dressed,1),N_det)
CI_electronic_energy_dressed(:) = 0.d0
do i=1,N_det
CI_eigenvectors_dressed(i,1) = eigenvectors(i,1)
enddo
integer :: i_state
double precision :: s2
i_state = 0
if (s2_eig) then
do j=1,N_det
call get_s2_u0(psi_det,eigenvectors(1,j),N_det,N_det,s2)
if(dabs(s2-expected_s2).le.0.3d0)then
i_state += 1
do i=1,N_det
CI_eigenvectors_dressed(i,i_state) = eigenvectors(i,j)
enddo
CI_electronic_energy_dressed(i_state) = eigenvalues(j)
CI_eigenvectors_s2_dressed(i_state) = s2
endif
if (i_state.ge.N_states_diag) then
exit
endif
enddo
else
do j=1,N_states_diag
call get_s2_u0(psi_det,eigenvectors(1,j),N_det,N_det,s2)
i_state += 1
do i=1,N_det
CI_eigenvectors_dressed(i,i_state) = eigenvectors(i,j)
enddo
CI_electronic_energy_dressed(i_state) = eigenvalues(j)
CI_eigenvectors_s2_dressed(i_state) = s2
enddo
endif
deallocate(eigenvectors,eigenvalues)
endif
END_PROVIDER
BEGIN_PROVIDER [ double precision, CI_energy_dressed, (N_states_diag) ]
implicit none
BEGIN_DOC
! N_states lowest eigenvalues of the dressed CI matrix
END_DOC
integer :: j
character*(8) :: st
call write_time(output_determinants)
do j=1,N_states_diag
CI_energy_dressed(j) = CI_electronic_energy_dressed(j) + nuclear_repulsion
enddo
END_PROVIDER
subroutine diagonalize_CI_dressed
implicit none
BEGIN_DOC
! Replace the coefficients of the CI states by the coefficients of the
! eigenstates of the CI matrix
END_DOC
integer :: i,j
do j=1,N_states_diag
do i=1,N_det
psi_coef(i,j) = CI_eigenvectors_dressed(i,j)
enddo
enddo
SOFT_TOUCH psi_coef
end
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