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https://github.com/QuantumPackage/qp2.git
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263 lines
7.1 KiB
Fortran
263 lines
7.1 KiB
Fortran
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! ---
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subroutine htilde_mu_mat_bi_ortho_tot_slow(key_j, key_i, Nint, htot)
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BEGIN_DOC
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! <key_j |H_tilde | key_i> where |key_j> is developed on the LEFT basis and |key_i> is developed on the RIGHT basis
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!!
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!! WARNING !!
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!
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! Non hermitian !!
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END_DOC
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use bitmasks
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implicit none
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integer, intent(in) :: Nint
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integer(bit_kind), intent(in) :: key_j(Nint,2),key_i(Nint,2)
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double precision, intent(out) :: htot
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double precision :: hmono, htwoe, hthree
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integer :: degree
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call get_excitation_degree(key_j, key_i, degree, Nint)
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if(degree.gt.2) then
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htot = 0.d0
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else
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call htilde_mu_mat_bi_ortho_slow(key_j, key_i, Nint, hmono, htwoe, hthree, htot)
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endif
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end
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! --
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subroutine htilde_mu_mat_bi_ortho_slow(key_j, key_i, Nint, hmono, htwoe, hthree, htot)
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BEGIN_DOC
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!
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! <key_j |H_tilde | key_i> where |key_j> is developed on the LEFT basis and |key_i> is developed on the RIGHT basis
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!!
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! Returns the detail of the matrix element in terms of single, two and three electron contribution.
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!! WARNING !!
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!
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! Non hermitian !!
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!
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END_DOC
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use bitmasks
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implicit none
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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) :: hmono, htwoe, hthree, htot
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integer :: degree
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hmono = 0.d0
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htwoe = 0.d0
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htot = 0.d0
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hthree = 0.d0
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call get_excitation_degree(key_i, key_j, degree, Nint)
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if(degree.gt.2) return
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if(degree == 0) then
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call diag_htc_bi_orth_2e_brute(Nint, key_i, hmono, htwoe, htot)
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else if (degree == 1) then
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call single_htilde_mu_mat_bi_ortho_slow(Nint, key_j, key_i, hmono, htwoe, htot)
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else if(degree == 2) then
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call double_htilde_mu_mat_bi_ortho_slow(Nint, key_j, key_i, hmono, htwoe, htot)
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endif
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if(three_body_h_tc) then
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if(degree == 2) then
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if((.not.double_normal_ord) .and. (elec_num .gt. 2) .and. three_e_5_idx_term) then
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call double_htilde_three_body_ints_bi_ort_slow(Nint, key_j, key_i, hthree)
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endif
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else if((degree == 1) .and. (elec_num .gt. 2) .and. three_e_4_idx_term) then
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call single_htilde_three_body_ints_bi_ort_slow(Nint, key_j, key_i, hthree)
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else if((degree == 0) .and. (elec_num .gt. 2) .and. three_e_3_idx_term) then
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call diag_htc_bi_orth_3e_brute(Nint, key_i, hthree)
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endif
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endif
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htot = hmono + htwoe + hthree
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if(degree==0) then
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htot += nuclear_repulsion
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if(noL_standard) then
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PROVIDE noL_0e
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htot += noL_0e
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endif
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endif
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end
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! ---
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subroutine double_htilde_mu_mat_bi_ortho_slow(Nint, key_j, key_i, hmono, htwoe, htot)
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BEGIN_DOC
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! <key_j |H_tilde | key_i> for double excitation ONLY FOR ONE- AND TWO-BODY TERMS
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!!
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!! WARNING !!
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!
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! Non hermitian !!
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END_DOC
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use bitmasks
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implicit none
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integer, intent(in) :: Nint
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integer(bit_kind), intent(in) :: key_j(Nint,2), key_i(Nint,2)
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double precision, intent(out) :: hmono, htwoe, htot
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integer :: occ(Nint*bit_kind_size,2)
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integer :: Ne(2), i, j, ii, jj, ispin, jspin, k, kk
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integer :: degree,exc(0:2,2,2)
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integer :: h1, p1, h2, p2, s1, s2
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integer :: other_spin(2)
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integer(bit_kind) :: key_i_core(Nint,2)
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double precision :: get_mo_two_e_integral_tc_int,phase
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! PROVIDE mo_two_e_integrals_tc_int_in_map mo_bi_ortho_tc_two_e
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other_spin(1) = 2
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other_spin(2) = 1
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call get_excitation_degree(key_i, key_j, degree, Nint)
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hmono = 0.d0
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htwoe= 0.d0
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htot = 0.d0
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if(degree.ne.2)then
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return
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endif
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call bitstring_to_list_ab(key_i, occ, Ne, Nint)
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call get_double_excitation(key_i, key_j, exc, phase, Nint)
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call decode_exc(exc, 2, h1, p1, h2, p2, s1, s2)
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if(s1.ne.s2)then
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! opposite spin two-body
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! key_j, key_i
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htwoe = mo_bi_ortho_tc_two_e(p2,p1,h2,h1)
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if(three_body_h_tc.and.double_normal_ord.and.+Ne(1).gt.2)then
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htwoe += normal_two_body_bi_orth(p2,h2,p1,h1)!!! WTF ???
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endif
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else
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! same spin two-body
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! direct terms
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htwoe = mo_bi_ortho_tc_two_e(p2,p1,h2,h1)
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! exchange terms
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htwoe -= mo_bi_ortho_tc_two_e(p1,p2,h2,h1)
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if(three_body_h_tc.and.double_normal_ord.and.+Ne(1).gt.2)then
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htwoe -= normal_two_body_bi_orth(h2,p1,h1,p2)!!! WTF ???
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htwoe += normal_two_body_bi_orth(h1,p1,h2,p2)!!! WTF ???
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endif
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endif
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htwoe *= phase
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htot = htwoe
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end
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subroutine single_htilde_mu_mat_bi_ortho_slow(Nint, key_j, key_i, hmono, htwoe, htot)
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BEGIN_DOC
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! <key_j |H_tilde | key_i> for single excitation ONLY FOR ONE- AND TWO-BODY TERMS
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!!
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!! WARNING !!
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!
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! Non hermitian !!
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END_DOC
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use bitmasks
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implicit none
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integer, intent(in) :: Nint
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integer(bit_kind), intent(in) :: key_j(Nint,2), key_i(Nint,2)
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double precision, intent(out) :: hmono, htwoe, htot
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integer :: occ(Nint*bit_kind_size,2)
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integer :: Ne(2), i, j, ii, jj, ispin, jspin, k, kk
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integer :: degree,exc(0:2,2,2)
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integer :: h1, p1, h2, p2, s1, s2
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double precision :: get_mo_two_e_integral_tc_int, phase
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double precision :: direct_int, exchange_int_12, exchange_int_23, exchange_int_13
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integer :: other_spin(2)
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integer(bit_kind) :: key_j_core(Nint,2), key_i_core(Nint,2)
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! PROVIDE mo_two_e_integrals_tc_int_in_map mo_bi_ortho_tc_two_e
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!
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! PROVIDE core_bitmask core_fock_operator mo_integrals_erf_map
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other_spin(1) = 2
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other_spin(2) = 1
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hmono = 0.d0
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htwoe= 0.d0
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htot = 0.d0
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call get_excitation_degree(key_i, key_j, degree, Nint)
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if(degree.ne.1)then
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return
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endif
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! if(core_tc_op)then
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! print*,'core_tc_op not already taken into account for bi ortho'
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! print*,'stopping ...'
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! stop
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! do i = 1, Nint
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! key_i_core(i,1) = xor(key_i(i,1),core_bitmask(i,1))
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! key_i_core(i,2) = xor(key_i(i,2),core_bitmask(i,2))
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! key_j_core(i,1) = xor(key_j(i,1),core_bitmask(i,1))
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! key_j_core(i,2) = xor(key_j(i,2),core_bitmask(i,2))
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! enddo
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! call bitstring_to_list_ab(key_i_core, occ, Ne, Nint)
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! else
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call bitstring_to_list_ab(key_i, occ, Ne, Nint)
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! endif
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call get_single_excitation(key_i, key_j, exc, phase, Nint)
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call decode_exc(exc,1,h1,p1,h2,p2,s1,s2)
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! if(h1==14.and.p1==2)then
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! print*,'h1,p1 old = ',h1,p1
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! endif
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hmono = mo_bi_ortho_tc_one_e(p1,h1) * phase
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! if(core_tc_op)then
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! print*,'core_tc_op not already taken into account for bi ortho'
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! print*,'stopping ...'
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! stop
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! hmono += phase * core_fock_operator(h1,p1)
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! endif
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! alpha/beta two-body
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ispin = other_spin(s1)
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if(s1==1)then
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! single alpha
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do i = 1, Ne(ispin) ! electron 2
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ii = occ(i,ispin)
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htwoe += mo_bi_ortho_tc_two_e(ii,p1,ii,h1)
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enddo
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else
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! single beta
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do i = 1, Ne(ispin) ! electron 1
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ii = occ(i,ispin)
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htwoe += mo_bi_ortho_tc_two_e(p1,ii,h1,ii)
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enddo
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endif
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! ! same spin two-body
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do i = 1, Ne(s1)
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ii = occ(i,s1)
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! (h1p1|ii ii) - (h1 ii| p1 ii)
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htwoe += mo_bi_ortho_tc_two_e(ii,p1,ii,h1) - mo_bi_ortho_tc_two_e(p1,ii,ii,h1)
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enddo
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htwoe *= phase
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htot = hmono + htwoe
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end
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