mirror of
https://github.com/LCPQ/quantum_package
synced 2024-12-25 05:43:47 +01:00
340 lines
9.8 KiB
Fortran
340 lines
9.8 KiB
Fortran
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subroutine i_O1_j(array,key_i,key_j,Nint,hij)
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use bitmasks
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implicit none
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BEGIN_DOC
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! Returns <i|O1|j> where i and j are determinants
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! and O1 is a ONE BODY OPERATOR
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! array is the array of the mono electronic operator
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! on the MO basis
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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), key_j(Nint,2)
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double precision, intent(out) :: hij
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double precision, intent(in) :: array(mo_tot_num_align,mo_tot_num)
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integer :: exc(0:2,2,2)
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integer :: degree
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integer :: m,p
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double precision :: diag_O1_mat_elem, phase
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ASSERT (Nint > 0)
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ASSERT (Nint == N_int)
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ASSERT (sum(popcnt(key_i(:,1))) == elec_alpha_num)
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ASSERT (sum(popcnt(key_i(:,2))) == elec_beta_num)
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ASSERT (sum(popcnt(key_j(:,1))) == elec_alpha_num)
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ASSERT (sum(popcnt(key_j(:,2))) == elec_beta_num)
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hij = 0.d0
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!DEC$ 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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hij = 0.d0
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case (1)
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call get_mono_excitation(key_i,key_j,exc,phase,Nint)
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if (exc(0,1,1) == 1) then
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! Mono alpha
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m = exc(1,1,1)
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p = exc(1,2,1)
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else
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! Mono beta
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m = exc(1,1,2)
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p = exc(1,2,2)
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endif
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hij = phase* array(m,p)
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case (0)
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hij = diag_O1_mat_elem(array,key_i,Nint)
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end select
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end
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subroutine i_O1_psi(array,key,keys,coef,Nint,Ndet,Ndet_max,Nstate,i_H_psi_array)
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use bitmasks
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implicit none
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integer, intent(in) :: Nint, Ndet,Ndet_max,Nstate
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double precision, intent(in) :: array(mo_tot_num_align,mo_tot_num)
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integer(bit_kind), intent(in) :: keys(Nint,2,Ndet)
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integer(bit_kind), intent(in) :: key(Nint,2)
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double precision, intent(in) :: coef(Ndet_max,Nstate)
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double precision, intent(out) :: i_H_psi_array(Nstate)
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integer :: i, ii,j
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double precision :: phase
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integer :: exc(0:2,2,2)
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double precision :: hij
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integer :: idx(0:Ndet)
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BEGIN_DOC
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! <key|O1|psi> for the various Nstates
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! and O1 is a ONE BODY OPERATOR
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! array is the array of the mono electronic operator
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! on the MO basis
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END_DOC
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ASSERT (Nint > 0)
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ASSERT (N_int == Nint)
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ASSERT (Nstate > 0)
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ASSERT (Ndet > 0)
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ASSERT (Ndet_max >= Ndet)
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i_H_psi_array = 0.d0
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call filter_connected_mono(keys,key,Nint,Ndet,idx)
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do ii=1,idx(0)
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i = idx(ii)
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!DEC$ FORCEINLINE
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call i_O1_j(array,keys(1,1,i),key,Nint,hij)
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do j = 1, Nstate
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i_H_psi_array(j) = i_H_psi_array(j) + coef(i,j)*hij
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enddo
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enddo
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end
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double precision function diag_O1_mat_elem(array,det_in,Nint)
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use bitmasks
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implicit none
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BEGIN_DOC
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! Computes <i|O1|i>
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END_DOC
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integer,intent(in) :: Nint
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integer(bit_kind),intent(in) :: det_in(Nint,2)
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double precision, intent(in) :: array(mo_tot_num_align,mo_tot_num)
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integer :: i, ispin,tmp
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integer :: occ_det(Nint*bit_kind_size,2)
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ASSERT (Nint > 0)
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ASSERT (sum(popcnt(det_in(:,1))) == elec_alpha_num)
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ASSERT (sum(popcnt(det_in(:,2))) == elec_beta_num)
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call bitstring_to_list(det_in(1,1), occ_det(1,1), tmp, Nint)
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call bitstring_to_list(det_in(1,2), occ_det(1,2), tmp, Nint)
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diag_O1_mat_elem = 0.d0
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do ispin = 1, 2
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do i = 1, elec_num_tab(ispin)
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diag_O1_mat_elem += array(occ_det(i,ispin),occ_det(i,ispin))
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enddo
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enddo
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end
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subroutine i_O1_psi_alpha_beta(array,key,keys,coef,Nint,Ndet,Ndet_max,Nstate,i_H_psi_array)
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use bitmasks
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implicit none
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integer, intent(in) :: Nint, Ndet,Ndet_max,Nstate
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double precision, intent(in) :: array(mo_tot_num_align,mo_tot_num)
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integer(bit_kind), intent(in) :: keys(Nint,2,Ndet)
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integer(bit_kind), intent(in) :: key(Nint,2)
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double precision, intent(in) :: coef(Ndet_max,Nstate)
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double precision, intent(out) :: i_H_psi_array(Nstate)
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integer :: i, ii,j
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double precision :: phase
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integer :: exc(0:2,2,2)
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double precision :: hij
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integer :: idx(0:Ndet)
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BEGIN_DOC
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! <key|O1(alpha) - O1(beta)|psi> for the various Nstates
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! and O1 is a ONE BODY OPERATOR
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! array is the array of the mono electronic operator
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! on the MO basis
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END_DOC
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ASSERT (Nint > 0)
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ASSERT (N_int == Nint)
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ASSERT (Nstate > 0)
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ASSERT (Ndet > 0)
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ASSERT (Ndet_max >= Ndet)
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i_H_psi_array = 0.d0
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call filter_connected_mono(keys,key,Nint,Ndet,idx)
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do ii=1,idx(0)
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i = idx(ii)
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!DEC$ FORCEINLINE
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call i_O1_j_alpha_beta(array,keys(1,1,i),key,Nint,hij)
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do j = 1, Nstate
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i_H_psi_array(j) = i_H_psi_array(j) + coef(i,j)*hij
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enddo
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enddo
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end
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subroutine i_O1_j_alpha_beta(array,key_i,key_j,Nint,hij)
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use bitmasks
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implicit none
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BEGIN_DOC
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! Returns <i|O1(alpha) - O1(beta)|j> where i and j are determinants
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! and O1 is a ONE BODY OPERATOR
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! array is the array of the mono electronic operator
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! on the MO basis
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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), key_j(Nint,2)
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double precision, intent(out) :: hij
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double precision, intent(in) :: array(mo_tot_num_align,mo_tot_num)
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integer :: exc(0:2,2,2)
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integer :: degree
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integer :: m,p
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double precision :: diag_O1_mat_elem_alpha_beta, phase
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ASSERT (Nint > 0)
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ASSERT (Nint == N_int)
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ASSERT (sum(popcnt(key_i(:,1))) == elec_alpha_num)
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ASSERT (sum(popcnt(key_i(:,2))) == elec_beta_num)
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ASSERT (sum(popcnt(key_j(:,1))) == elec_alpha_num)
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ASSERT (sum(popcnt(key_j(:,2))) == elec_beta_num)
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hij = 0.d0
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!DEC$ 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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hij = 0.d0
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case (1)
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call get_mono_excitation(key_i,key_j,exc,phase,Nint)
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if (exc(0,1,1) == 1) then
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! Mono alpha
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m = exc(1,1,1)
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p = exc(1,2,1)
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hij = phase* array(m,p)
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else
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! Mono beta
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m = exc(1,1,2)
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p = exc(1,2,2)
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hij = -phase* array(m,p)
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endif
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case (0)
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hij = diag_O1_mat_elem_alpha_beta(array,key_i,Nint)
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end select
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end
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double precision function diag_O1_mat_elem_alpha_beta(array,det_in,Nint)
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use bitmasks
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implicit none
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BEGIN_DOC
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! Computes <i|O1(alpha) -O1(beta)|i>
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END_DOC
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integer,intent(in) :: Nint
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integer(bit_kind),intent(in) :: det_in(Nint,2)
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double precision, intent(in) :: array(mo_tot_num_align,mo_tot_num)
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integer :: i, ispin,tmp
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integer :: occ_det(Nint*bit_kind_size,2)
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ASSERT (Nint > 0)
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ASSERT (sum(popcnt(det_in(:,1))) == elec_alpha_num)
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ASSERT (sum(popcnt(det_in(:,2))) == elec_beta_num)
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call bitstring_to_list(det_in(1,1), occ_det(1,1), tmp, Nint)
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call bitstring_to_list(det_in(1,2), occ_det(1,2), tmp, Nint)
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diag_O1_mat_elem_alpha_beta = 0.d0
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ispin = 1
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do i = 1, elec_num_tab(ispin)
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diag_O1_mat_elem_alpha_beta += array(occ_det(i,ispin),occ_det(i,ispin))
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enddo
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ispin = 2
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do i = 1, elec_num_tab(ispin)
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diag_O1_mat_elem_alpha_beta -= array(occ_det(i,ispin),occ_det(i,ispin))
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enddo
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end
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subroutine filter_connected_mono(key1,key2,Nint,sze,idx)
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use bitmasks
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implicit none
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BEGIN_DOC
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! Filters out the determinants that are not connected through PURE
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!
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! MONO EXCITATIONS OPERATORS (a^{\dagger}j a_i)
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!
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! returns the array idx which contains the index of the
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!
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! determinants in the array key1 that interact
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!
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! via some PURE MONO EXCITATIONS OPERATORS
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!
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! idx(0) is the number of determinants that interact with key1
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END_DOC
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integer, intent(in) :: Nint, sze
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integer(bit_kind), intent(in) :: key1(Nint,2,sze)
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integer(bit_kind), intent(in) :: key2(Nint,2)
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integer, intent(out) :: idx(0:sze)
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integer :: i,j,l
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integer :: degree_x2
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ASSERT (Nint > 0)
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ASSERT (sze >= 0)
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l=1
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if (Nint==1) then
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!DIR$ LOOP COUNT (1000)
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do i=1,sze
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degree_x2 = popcnt( xor( key1(1,1,i), key2(1,1))) &
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+ popcnt( xor( key1(1,2,i), key2(1,2)))
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if (degree_x2 > 3) then
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cycle
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else
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idx(l) = i
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l = l+1
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endif
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enddo
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else if (Nint==2) then
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!DIR$ LOOP COUNT (1000)
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do i=1,sze
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degree_x2 = popcnt(xor( key1(1,1,i), key2(1,1))) + &
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popcnt(xor( key1(2,1,i), key2(2,1))) + &
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popcnt(xor( key1(1,2,i), key2(1,2))) + &
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popcnt(xor( key1(2,2,i), key2(2,2)))
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if (degree_x2 > 3) then
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cycle
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else
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idx(l) = i
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l = l+1
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endif
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enddo
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else if (Nint==3) then
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!DIR$ LOOP COUNT (1000)
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do i=1,sze
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degree_x2 = popcnt(xor( key1(1,1,i), key2(1,1))) + &
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popcnt(xor( key1(1,2,i), key2(1,2))) + &
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popcnt(xor( key1(2,1,i), key2(2,1))) + &
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popcnt(xor( key1(2,2,i), key2(2,2))) + &
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popcnt(xor( key1(3,1,i), key2(3,1))) + &
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popcnt(xor( key1(3,2,i), key2(3,2)))
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if (degree_x2 > 3) then
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cycle
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else
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idx(l) = i
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l = l+1
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endif
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enddo
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else
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!DIR$ LOOP COUNT (1000)
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do i=1,sze
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degree_x2 = 0
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!DEC$ LOOP COUNT MIN(4)
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do j=1,Nint
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degree_x2 = degree_x2+ popcnt(xor( key1(j,1,i), key2(j,1))) +&
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popcnt(xor( key1(j,2,i), key2(j,2)))
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if (degree_x2 > 3) then
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exit
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endif
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enddo
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if (degree_x2 <= 3) then
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idx(l) = i
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l = l+1
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endif
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enddo
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endif
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idx(0) = l-1
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end
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