mirror of
https://github.com/QuantumPackage/qp2.git
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161 lines
5.1 KiB
Plaintext
161 lines
5.1 KiB
Plaintext
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BEGIN_PROVIDER [ double precision, mo_energy_expval, (N_states,mo_num,2,2)]
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use bitmasks
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implicit none
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BEGIN_DOC
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! Third index is spin.
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! Fourth index is 1:creation, 2:annihilation
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END_DOC
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integer :: i,j,k
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integer :: ispin, istate
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integer :: hp
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double precision :: norm_out(N_states)
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integer, parameter :: hole_particle(2) = (/ -1, 1 /)
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double precision :: energies(n_states)
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integer(bit_kind), allocatable :: psi_in_out(:,:,:)
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double precision, allocatable :: psi_in_out_coef(:,:)
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double precision :: E0(N_states), norm
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double precision, parameter :: t=1.d-3
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allocate (psi_in_out(N_int,2,N_det),psi_in_out_coef(N_det,N_states))
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mo_energy_expval = 0.d0
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psi_in_out_coef(1:N_det,1:N_states) = psi_coef(1:N_det,1:N_states)
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psi_in_out(1:N_int,1:2,1:N_det) = psi_det(1:N_int,1:2,1:N_det)
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! Truncate the wave function
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do istate=1,N_states
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norm = 0.d0
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do k=1,N_det
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if (dabs(psi_in_out_coef(k,istate)) < t) then
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psi_in_out_coef(k,istate) = 0.d0
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endif
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norm = norm + psi_in_out_coef(k,istate)*psi_in_out_coef(k,istate)
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enddo
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ASSERT (norm > 0.d0)
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norm = 1.d0/dsqrt(norm)
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psi_in_out_coef(1:N_det,istate) = psi_in_out_coef(1:N_det,istate) * norm
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call au0_h_au0(E0,psi_in_out,psi_in_out_coef,N_det,size(psi_in_out_coef,1))
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enddo
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do hp=1,2
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do ispin=1,2
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do i=1,mo_num
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psi_in_out_coef(1:N_det,1:N_states) = psi_coef(1:N_det,1:N_states)
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psi_in_out(1:N_int,1:2,1:N_det) = psi_det(1:N_int,1:2,1:N_det)
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call apply_exc_to_psi(i,hole_particle(hp),ispin, &
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norm_out,psi_in_out,psi_in_out_coef, N_det,N_det,N_det,N_states)
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! Truncate the wave function
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do istate=1,N_states
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norm = 0.d0
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do k=1,N_det
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if (dabs(psi_in_out_coef(k,istate)) < t) then
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psi_in_out_coef(k,istate) = 0.d0
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endif
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norm = norm + psi_in_out_coef(k,istate)*psi_in_out_coef(k,istate)
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enddo
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if (norm == 0.d0) then
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cycle
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endif
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norm = 1.d0/dsqrt(norm)
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psi_in_out_coef(1:N_det,istate) = psi_in_out_coef(1:N_det,istate) * norm
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enddo
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call au0_h_au0(energies,psi_in_out,psi_in_out_coef,N_det,size(psi_in_out_coef,1))
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mo_energy_expval(1:N_states,i,ispin,hp) = energies(1:N_states) - E0(1:N_states)
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print *, i, ispin, real(energies(1)), real(E0(1))
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enddo
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enddo
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enddo
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mo_energy_expval(1:N_states,1:mo_num,1:2,1) = -mo_energy_expval(1:N_states,1:mo_num,1:2,1)
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END_PROVIDER
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subroutine au0_h_au0(energies,psi_in,psi_in_coef,ndet,dim_psi_coef)
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use bitmasks
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implicit none
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integer, intent(in) :: ndet,dim_psi_coef
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integer(bit_kind), intent(in) :: psi_in(N_int,2,Ndet)
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double precision, intent(in) :: psi_in_coef(dim_psi_coef,N_states)
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double precision, intent(out) :: energies(N_states)
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integer :: i,j, istate
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double precision :: hij,accu
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double precision, allocatable :: psi_coef_tmp(:)
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energies(1:N_states) = 0.d0
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do i = 1, Ndet
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if(sum(dabs(psi_in_coef(i,1:N_states)))==0.d0) then
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cycle
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endif
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call diag_H_mat_elem_au0_h_au0(psi_in(1,1,i),N_int,hij)
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do istate=1,N_states
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energies(istate) += psi_in_coef(i,istate) * psi_in_coef(i,istate) * hij
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enddo
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do j = i+1, Ndet
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if(sum(dabs(psi_in_coef(j,1:N_states)))==0.d0) then
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cycle
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endif
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call i_H_j(psi_in(1,1,i),psi_in(1,1,j),N_int,hij)
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hij = hij+hij
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do istate=1,N_states
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energies(istate) = energies(istate) + psi_in_coef(i,istate) * psi_in_coef(j,istate) * hij
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enddo
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enddo
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enddo
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end
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subroutine diag_H_mat_elem_au0_h_au0(det_in,Nint,hii)
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use bitmasks
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implicit none
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BEGIN_DOC
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! Computes $\langle i|H|i \rangle$ for any determinant $|i\rangle$.
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! Used for wave functions with an additional electron.
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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(out) :: hii
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integer :: i, j, iorb, jorb
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integer :: occ(Nint*bit_kind_size,2)
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integer :: elec_num_tab_local(2)
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hii = 0.d0
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call bitstring_to_list(det_in(1,1), occ(1,1), elec_num_tab_local(1), Nint)
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call bitstring_to_list(det_in(1,2), occ(1,2), elec_num_tab_local(2), Nint)
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! alpha - alpha
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do i = 1, elec_num_tab_local(1)
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iorb = occ(i,1)
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hii += mo_one_e_integrals(iorb,iorb)
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do j = i+1, elec_num_tab_local(1)
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jorb = occ(j,1)
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hii += mo_two_e_integrals_jj_anti(jorb,iorb)
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enddo
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enddo
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! beta - beta
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do i = 1, elec_num_tab_local(2)
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iorb = occ(i,2)
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hii += mo_one_e_integrals(iorb,iorb)
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do j = i+1, elec_num_tab_local(2)
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jorb = occ(j,2)
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hii += mo_two_e_integrals_jj_anti(jorb,iorb)
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enddo
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enddo
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! alpha - beta
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do i = 1, elec_num_tab_local(2)
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iorb = occ(i,2)
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do j = 1, elec_num_tab_local(1)
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jorb = occ(j,1)
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hii += mo_two_e_integrals_jj(jorb,iorb)
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enddo
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enddo
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end
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