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https://github.com/LCPQ/quantum_package
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139 lines
4.3 KiB
Fortran
139 lines
4.3 KiB
Fortran
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program pouet
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implicit none
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print*,'HF energy = ',ref_bitmask_energy + nuclear_repulsion
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call routine
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end
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subroutine routine
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use bitmasks
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implicit none
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integer :: i,j,k,l
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double precision :: hij,get_mo_bielec_integral
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double precision :: hmono,h_bi_ispin,h_bi_other_spin
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integer(bit_kind),allocatable :: key_tmp(:,:)
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integer, allocatable :: occ(:,:)
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integer :: n_occ_alpha, n_occ_beta
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! First checks
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print*,'N_int = ',N_int
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print*,'mo_tot_num = ',mo_tot_num
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print*,'mo_tot_num / 64+1= ',mo_tot_num/64+1
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! We print the HF determinant
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do i = 1, N_int
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print*,'ref_bitmask(i,1) = ',ref_bitmask(i,1)
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print*,'ref_bitmask(i,2) = ',ref_bitmask(i,2)
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enddo
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print*,''
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print*,'Hartree Fock determinant ...'
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call debug_det(ref_bitmask,N_int)
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allocate(key_tmp(N_int,2))
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! We initialize key_tmp to the Hartree Fock one
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key_tmp = ref_bitmask
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integer :: i_hole,i_particle,ispin,i_ok,other_spin
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! We do a mono excitation on the top of the HF determinant
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write(*,*)'Enter the (hole, particle) couple for the mono excitation ...'
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read(5,*)i_hole,i_particle
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!!i_hole = 4
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!!i_particle = 20
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write(*,*)'Enter the ispin variable ...'
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write(*,*)'ispin = 1 ==> alpha '
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write(*,*)'ispin = 2 ==> beta '
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read(5,*)ispin
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if(ispin == 1)then
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other_spin = 2
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else if(ispin == 2)then
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other_spin = 1
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else
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print*,'PB !! '
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print*,'ispin must be 1 or 2 !'
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stop
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endif
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!!ispin = 1
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call do_mono_excitation(key_tmp,i_hole,i_particle,ispin,i_ok)
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! We check if it the excitation was possible with "i_ok"
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if(i_ok == -1)then
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print*,'i_ok = ',i_ok
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print*,'You can not do this excitation because of Pauli principle ...'
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print*,'check your hole particle couple, there must be something wrong ...'
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stop
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endif
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print*,'New det = '
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call debug_det(key_tmp,N_int)
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call i_H_j(key_tmp,ref_bitmask,N_int,hij)
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! We calculate the H matrix element between the new determinant and HF
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print*,'<D_i|H|D_j> = ',hij
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print*,''
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print*,''
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print*,'Recalculating it old school style ....'
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print*,''
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print*,''
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! We recalculate this old school style !!!
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! Mono electronic part
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hmono = mo_mono_elec_integral(i_hole,i_particle)
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print*,''
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print*,'Mono electronic part '
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print*,''
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print*,'<D_i|h(1)|D_j> = ',hmono
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h_bi_ispin = 0.d0
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h_bi_other_spin = 0.d0
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print*,''
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print*,'Getting all the info for the calculation of the bi electronic part ...'
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print*,''
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allocate (occ(N_int*bit_kind_size,2))
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! We get the occupation of the alpha electrons in occ(:,1)
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call bitstring_to_list(key_tmp(1,1), occ(1,1), n_occ_alpha, N_int)
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print*,'n_occ_alpha = ',n_occ_alpha
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print*,'elec_alpha_num = ',elec_alpha_num
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! We get the occupation of the beta electrons in occ(:,2)
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call bitstring_to_list(key_tmp(1,2), occ(1,2), n_occ_beta, N_int)
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print*,'n_occ_beta = ',n_occ_beta
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print*,'elec_beta_num = ',elec_beta_num
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! We print the occupation of the alpha electrons
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print*,'Alpha electrons !'
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do i = 1, n_occ_alpha
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print*,'i = ',i
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print*,'occ(i,1) = ',occ(i,1)
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enddo
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! We print the occupation of the beta electrons
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print*,'Alpha electrons !'
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do i = 1, n_occ_beta
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print*,'i = ',i
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print*,'occ(i,2) = ',occ(i,2)
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enddo
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integer :: exc(0:2,2,2),degree,h1,p1,h2,p2,s1,s2
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double precision :: phase
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call get_excitation_degree(key_tmp,ref_bitmask,degree,N_int)
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print*,'degree = ',degree
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call get_mono_excitation(ref_bitmask,key_tmp,exc,phase,N_int)
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call decode_exc(exc,degree,h1,p1,h2,p2,s1,s2)
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print*,'h1 = ',h1
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print*,'p1 = ',p1
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print*,'s1 = ',s1
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print*,'phase = ',phase
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do i = 1, elec_num_tab(ispin)
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integer :: orb_occupied
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orb_occupied = occ(i,ispin)
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h_bi_ispin += get_mo_bielec_integral(i_hole,orb_occupied,i_particle,orb_occupied,mo_integrals_map) &
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-get_mo_bielec_integral(i_hole,i_particle,orb_occupied,orb_occupied,mo_integrals_map)
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enddo
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print*,'h_bi_ispin = ',h_bi_ispin
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do i = 1, elec_num_tab(other_spin)
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orb_occupied = occ(i,other_spin)
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h_bi_other_spin += get_mo_bielec_integral(i_hole,orb_occupied,i_particle,orb_occupied,mo_integrals_map)
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enddo
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print*,'h_bi_other_spin = ',h_bi_other_spin
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print*,'h_bi_ispin + h_bi_other_spin = ',h_bi_ispin + h_bi_other_spin
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print*,'Total matrix element = ',phase*(h_bi_ispin + h_bi_other_spin + hmono)
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!i = 1
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!j = 1
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!k = 1
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!l = 1
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!hij = get_mo_bielec_integral(i,j,k,l,mo_integrals_map)
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!print*,'<ij|kl> = ',hij
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end
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