target_groundstate.F90

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!! Copyright (C) 2002-2006 M. Marques, A. Castro, A. Rubio, G. Bertsch
!!
!! This program is free software; you can redistribute it and/or modify
!! it under the terms of the GNU General Public License as published by
!! the Free Software Foundation; either version 2, or (at your option)
!! any later version.
!!
!! This program is distributed in the hope that it will be useful,
!! but WITHOUT ANY WARRANTY; without even the implied warranty of
!! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
!! GNU General Public License for more details.
!!
!! You should have received a copy of the GNU General Public License
!! along with this program; if not, write to the Free Software
!! Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
!! 02110-1301, USA.
!!
 
#include "global.h"
 
module target_ground_state_oct_m
  use debug_oct_m
  use global_oct_m
  use grid_oct_m
  use hamiltonian_elec_oct_m
  use io_oct_m
  use ions_oct_m
  use ion_dynamics_oct_m
  use, intrinsic :: iso_fortran_env
  use kpoints_oct_m
  use mesh_oct_m
  use mesh_function_oct_m
  use messages_oct_m
  use namespace_oct_m
  use output_oct_m
  use output_low_oct_m
  use profiling_oct_m
  use restart_oct_m
  use space_oct_m
  use states_elec_oct_m
  use states_elec_restart_oct_m
  use target_low_oct_m
  use td_oct_m
 
  implicit none
 
  private
  public ::                    &
    target_init_groundstate,   &
    target_j1_groundstate,     &
    target_output_groundstate, &
    target_chi_groundstate
 
 
contains
 
  ! ----------------------------------------------------------------------
  subroutine target_init_groundstate(mesh, namespace, space, tg, td, restart, kpoints)
    class(mesh_t),     intent(in)    :: mesh
    type(namespace_t), intent(in)    :: namespace
    class(space_t),    intent(in)    :: space
    type(target_t),    intent(inout) :: tg
    type(td_t),        intent(in)    :: td
    type(restart_t),   intent(in)    :: restart
    type(kpoints_t),   intent(in)    :: kpoints
 
    integer :: ierr
 
    push_sub(target_init_groundstate)
 
    message(1) =  'Info: Using Ground State for TargetOperator'
    call messages_info(1, namespace=namespace)
 
    call states_elec_load(restart, namespace, space, tg%st, mesh, kpoints, ierr)
    if (ierr /= 0) then
      message(1) = "Unable to read wavefunctions."
      call messages_fatal(1, namespace=namespace)
    end if
 
    tg%move_ions = td%ions_dyn%ions_move()
    tg%dt = td%dt
 
    pop_sub(target_init_groundstate)
  end subroutine target_init_groundstate
 
 
  ! ----------------------------------------------------------------------
  subroutine target_output_groundstate(tg, namespace, space, gr, dir, ions, hm, outp)
    type(target_t),      intent(in) :: tg
    type(namespace_t),   intent(in) :: namespace
    class(space_t),      intent(in)    :: space
    type(grid_t),        intent(in) :: gr
    character(len=*),    intent(in) :: dir
    type(ions_t),        intent(in) :: ions
    type(hamiltonian_elec_t), intent(in) :: hm
    type(output_t),      intent(in) :: outp
 
    push_sub(target_output_groundstate)
 
    call io_mkdir(trim(dir), namespace)
    call output_states(outp, namespace, space, trim(dir), tg%st, gr, ions, hm, -1)
 
    pop_sub(target_output_groundstate)
  end subroutine target_output_groundstate
  ! ----------------------------------------------------------------------
 
 
  ! ----------------------------------------------------------------------
  real(real64) function target_j1_groundstate(tg, gr, psi) result(j1)
    type(target_t),      intent(in) :: tg
    type(grid_t),        intent(in) :: gr
    type(states_elec_t), intent(in) :: psi
 
    integer :: ist, ik
    complex(real64), allocatable :: zpsi(:, :), zst(:, :)
 
    push_sub(target_j1_groundstate)
 
    safe_allocate(zpsi(1:gr%np, 1:tg%st%d%dim))
    safe_allocate(zst(1:gr%np, 1:tg%st%d%dim))
 
    j1 = m_zero
 
    do ik = 1, psi%nik
      do ist = psi%st_start, psi%st_end
        call states_elec_get_state(psi, gr, ist, ik, zpsi)
        call states_elec_get_state(tg%st, gr, ist, ik, zst)
 
        j1 = j1 + psi%occ(ist, ik)*abs(zmf_dotp(gr, psi%d%dim, zpsi, zst))**2
 
      end do
    end do
 
    safe_deallocate_a(zpsi)
    safe_deallocate_a(zst)
 
    pop_sub(target_j1_groundstate)
  end function target_j1_groundstate
 
 
  ! ----------------------------------------------------------------------
  subroutine target_chi_groundstate(tg, gr, psi_in, chi_out)
    type(target_t),       intent(in)    :: tg
    type(grid_t),         intent(in)    :: gr
    type(states_elec_t),  intent(in)    :: psi_in
    type(states_elec_t),  intent(inout) :: chi_out
 
    integer :: ik, ist
    complex(real64) :: olap
    complex(real64), allocatable :: zpsi(:, :), zst(:, :), zchi(:, :)
 
    push_sub(target_chi_groundstate)
 
    safe_allocate(zpsi(1:gr%np, 1:tg%st%d%dim))
    safe_allocate(zst(1:gr%np, 1:tg%st%d%dim))
    safe_allocate(zchi(1:gr%np, 1:tg%st%d%dim))
 
    do ik = 1, psi_in%nik
      do ist = psi_in%st_start, psi_in%st_end
 
        call states_elec_get_state(psi_in, gr, ist, ik, zpsi)
        call states_elec_get_state(tg%st, gr, ist, ik, zst)
 
        olap = zmf_dotp(gr, zst(:, 1), zpsi(:, 1))
        zchi(1:gr%np, 1:tg%st%d%dim) = olap*zst(1:gr%np, 1:tg%st%d%dim)
 
        call states_elec_set_state(chi_out, gr, ist, ik, zchi)
 
      end do
    end do
 
    safe_deallocate_a(zpsi)
    safe_deallocate_a(zst)
    safe_deallocate_a(zchi)
 
    pop_sub(target_chi_groundstate)
  end subroutine target_chi_groundstate
 
end module target_ground_state_oct_m
 
!! Local Variables:
!! mode: f90
!! coding: utf-8
!! End: