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https://github.com/LCPQ/quantum_package
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72 lines
2.2 KiB
Fortran
72 lines
2.2 KiB
Fortran
subroutine i_H_psi_pert_new_minilist(key,keys,idx_key,N_minilist,coef,Nint,Ndet,Ndet_max,Nstate,i_H_psi_array,coef_pert)
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use bitmasks
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implicit none
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integer, intent(in) :: Nint, Ndet,Ndet_max,Nstate,idx_key(Ndet), N_minilist
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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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double precision, intent(out) :: coef_pert
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integer :: idx(0:Ndet)
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integer :: i, ii,j, i_in_key, i_in_coef
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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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double precision :: delta_e_final
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double precision :: hjj
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BEGIN_DOC
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! Computes <i|H|Psi> = \sum_J c_J <i|H|J>.
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!
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! Uses filter_connected_i_H_psi0 to get all the |J> to which |i>
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! is connected. The |J> are searched in short pre-computed lists.
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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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coef_pert = 0.d0
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call filter_connected_i_H_psi0(keys,key,Nint,N_minilist,idx)
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double precision :: coef_array(Nstate)
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if (Nstate == 1) then
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do ii=1,idx(0)
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i_in_key = idx(ii)
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i_in_coef = idx_key(idx(ii))
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!DIR$ FORCEINLINE
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call i_H_j(keys(1,1,i_in_key),key,Nint,hij)
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i_H_psi_array(1) = i_H_psi_array(1) + coef(i_in_coef,1)*hij
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do i = 1, Nstate
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coef_array(i) = coef(i_in_coef,i)
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enddo
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call get_delta_e_dyall(keys(1,1,i_in_key),key,coef_array,hij,delta_e_final)
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coef_pert += coef(i_in_coef,1)*hij / delta_e_final
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enddo
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if (coef_pert * i_H_psi_array(1) > 0.d0)then
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print*, coef_pert * i_H_psi_array(1)
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endif
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else
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do ii=1,idx(0)
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i_in_key = idx(ii)
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i_in_coef = idx_key(idx(ii))
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!DIR$ FORCEINLINE
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call i_H_j(keys(1,1,i_in_key),key,Nint,hij)
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i_H_psi_array(1) = i_H_psi_array(1) + coef(i_in_coef,1)*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_in_coef,j)*hij
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enddo
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enddo
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endif
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end
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