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https://github.com/QuantumPackage/qp2.git
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81 lines
2.6 KiB
Fortran
81 lines
2.6 KiB
Fortran
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BEGIN_PROVIDER [ double precision, tc_transition_matrix, (mo_num, mo_num,N_states,N_states) ]
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implicit none
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BEGIN_DOC
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! tc_transition_matrix(p,h,istate,jstate) = <Chi_istate| a^\dagger_p a_h |Phi_jstate>
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!
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! where <Chi_istate| and |Phi_jstate> are the left/right eigenvectors on a bi-ortho basis
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END_DOC
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integer :: i,j,istate,jstate,m,n,p,h
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double precision :: phase
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integer, allocatable :: occ(:,:)
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integer :: n_occ_ab(2),degree,exc(0:2,2,2)
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allocate(occ(N_int*bit_kind_size,2))
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tc_transition_matrix = 0.d0
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do istate = 1, N_states
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do jstate = 1, N_states
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do i = 1, N_det
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do j = 1, N_det
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call get_excitation_degree(psi_det(1,1,i),psi_det(1,1,j),degree,N_int)
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if(degree.gt.1)then
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cycle
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else if (degree == 0)then
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call bitstring_to_list_ab(psi_det(1,1,i), occ, n_occ_ab, N_int)
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do p = 1, n_occ_ab(1) ! browsing the alpha electrons
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m = occ(p,1)
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tc_transition_matrix(m,m,istate,jstate)+= psi_l_coef_bi_ortho(i,istate) * psi_r_coef_bi_ortho(j,jstate)
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enddo
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do p = 1, n_occ_ab(2) ! browsing the beta electrons
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m = occ(p,1)
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tc_transition_matrix(m,m,istate,jstate)+= psi_l_coef_bi_ortho(i,istate) * psi_r_coef_bi_ortho(j,jstate)
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enddo
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else
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call get_single_excitation(psi_det(1,1,j),psi_det(1,1,i),exc,phase,N_int)
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if (exc(0,1,1) == 1) then
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! Single alpha
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h = exc(1,1,1) ! hole in psi_det(1,1,j)
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p = exc(1,2,1) ! particle in psi_det(1,1,j)
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else
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! Single beta
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h = exc(1,1,2) ! hole in psi_det(1,1,j)
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p = exc(1,2,2) ! particle in psi_det(1,1,j)
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endif
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tc_transition_matrix(p,h,istate,jstate)+= phase * psi_l_coef_bi_ortho(i,istate) * psi_r_coef_bi_ortho(j,jstate)
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endif
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enddo
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enddo
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enddo
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enddo
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END_PROVIDER
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BEGIN_PROVIDER [double precision, tc_bi_ortho_dipole, (3,N_states)]
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implicit none
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integer :: i,j,istate,m
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double precision :: nuclei_part(3)
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tc_bi_ortho_dipole = 0.d0
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do istate = 1, N_states
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do i = 1, mo_num
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do j = 1, mo_num
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tc_bi_ortho_dipole(1,istate) += -(tc_transition_matrix(j,i,istate,istate)) * mo_bi_orth_bipole_x(j,i)
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tc_bi_ortho_dipole(2,istate) += -(tc_transition_matrix(j,i,istate,istate)) * mo_bi_orth_bipole_y(j,i)
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tc_bi_ortho_dipole(3,istate) += -(tc_transition_matrix(j,i,istate,istate)) * mo_bi_orth_bipole_z(j,i)
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enddo
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enddo
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enddo
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nuclei_part = 0.d0
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do m = 1, 3
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do i = 1,nucl_num
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nuclei_part(m) += nucl_charge(i) * nucl_coord(i,m)
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enddo
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enddo
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!
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do istate = 1, N_states
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do m = 1, 3
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tc_bi_ortho_dipole(m,istate) += nuclei_part(m)
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enddo
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enddo
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END_PROVIDER
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