mirror of
https://github.com/LCPQ/quantum_package
synced 2024-06-02 11:25:26 +02:00
87 lines
3.6 KiB
Fortran
87 lines
3.6 KiB
Fortran
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BEGIN_PROVIDER[double precision, energy_sr_x_LDA, (N_states) ]
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&BEGIN_PROVIDER[double precision, energy_sr_c_LDA, (N_states) ]
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implicit none
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BEGIN_DOC
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! exchange/correlation energy with the short range LDA functional
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END_DOC
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integer :: istate,i,j
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double precision :: r(3)
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double precision :: mu,weight
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double precision :: e_c,vc_a,vc_b,e_x,vx_a,vx_b
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double precision, allocatable :: rhoa(:),rhob(:)
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allocate(rhoa(N_states), rhob(N_states))
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energy_sr_x_LDA = 0.d0
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energy_sr_c_LDA = 0.d0
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do istate = 1, N_states
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do i = 1, n_points_final_grid
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r(1) = final_grid_points(1,i)
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r(2) = final_grid_points(2,i)
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r(3) = final_grid_points(3,i)
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weight = final_weight_at_r_vector(i)
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rhoa(istate) = one_e_dm_alpha_at_r(i,istate)
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rhob(istate) = one_e_dm_beta_at_r(i,istate)
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call ec_LDA_sr(mu_erf_dft,rhoa(istate),rhob(istate),e_c,vc_a,vc_b)
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call ex_LDA_sr(mu_erf_dft,rhoa(istate),rhob(istate),e_x,vx_a,vx_b)
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energy_sr_x_LDA(istate) += weight * e_x
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energy_sr_c_LDA(istate) += weight * e_c
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enddo
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enddo
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END_PROVIDER
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BEGIN_PROVIDER[double precision, energy_sr_x_PBE, (N_states) ]
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&BEGIN_PROVIDER[double precision, energy_sr_c_PBE, (N_states) ]
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implicit none
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BEGIN_DOC
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! exchange/correlation energy with the short range PBE functional
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END_DOC
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integer :: istate,i,j,m
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double precision :: r(3)
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double precision :: mu,weight
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double precision, allocatable :: ex(:), ec(:)
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double precision, allocatable :: rho_a(:),rho_b(:),grad_rho_a(:,:),grad_rho_b(:,:),grad_rho_a_2(:),grad_rho_b_2(:),grad_rho_a_b(:)
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double precision, allocatable :: contrib_grad_xa(:,:),contrib_grad_xb(:,:),contrib_grad_ca(:,:),contrib_grad_cb(:,:)
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double precision, allocatable :: vc_rho_a(:), vc_rho_b(:), vx_rho_a(:), vx_rho_b(:)
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double precision, allocatable :: vx_grad_rho_a_2(:), vx_grad_rho_b_2(:), vx_grad_rho_a_b(:), vc_grad_rho_a_2(:), vc_grad_rho_b_2(:), vc_grad_rho_a_b(:)
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allocate(vc_rho_a(N_states), vc_rho_b(N_states), vx_rho_a(N_states), vx_rho_b(N_states))
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allocate(vx_grad_rho_a_2(N_states), vx_grad_rho_b_2(N_states), vx_grad_rho_a_b(N_states), vc_grad_rho_a_2(N_states), vc_grad_rho_b_2(N_states), vc_grad_rho_a_b(N_states))
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allocate(rho_a(N_states), rho_b(N_states),grad_rho_a(3,N_states),grad_rho_b(3,N_states))
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allocate(grad_rho_a_2(N_states),grad_rho_b_2(N_states),grad_rho_a_b(N_states), ex(N_states), ec(N_states))
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energy_sr_x_PBE = 0.d0
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energy_sr_c_PBE = 0.d0
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do istate = 1, N_states
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do i = 1, n_points_final_grid
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r(1) = final_grid_points(1,i)
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r(2) = final_grid_points(2,i)
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r(3) = final_grid_points(3,i)
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weight = final_weight_at_r_vector(i)
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rho_a(istate) = one_e_dm_and_grad_alpha_in_r(4,i,istate)
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rho_b(istate) = one_e_dm_and_grad_beta_in_r(4,i,istate)
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grad_rho_a(1:3,istate) = one_e_dm_and_grad_alpha_in_r(1:3,i,istate)
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grad_rho_b(1:3,istate) = one_e_dm_and_grad_beta_in_r(1:3,i,istate)
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grad_rho_a_2 = 0.d0
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grad_rho_b_2 = 0.d0
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grad_rho_a_b = 0.d0
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do m = 1, 3
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grad_rho_a_2(istate) += grad_rho_a(m,istate) * grad_rho_a(m,istate)
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grad_rho_b_2(istate) += grad_rho_b(m,istate) * grad_rho_b(m,istate)
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grad_rho_a_b(istate) += grad_rho_a(m,istate) * grad_rho_b(m,istate)
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enddo
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! inputs
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call GGA_sr_type_functionals(r,rho_a,rho_b,grad_rho_a_2,grad_rho_b_2,grad_rho_a_b, & ! outputs exchange
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ex,vx_rho_a,vx_rho_b,vx_grad_rho_a_2,vx_grad_rho_b_2,vx_grad_rho_a_b, & ! outputs correlation
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ec,vc_rho_a,vc_rho_b,vc_grad_rho_a_2,vc_grad_rho_b_2,vc_grad_rho_a_b )
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energy_sr_x_PBE += ex * weight
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energy_sr_c_PBE += ec * weight
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enddo
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enddo
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END_PROVIDER
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