mirror of https://gitlab.com/QEF/q-e.git
124 lines
3.6 KiB
Fortran
124 lines
3.6 KiB
Fortran
!
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! Copyright (C) 2001 PWSCF group
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! This file is distributed under the terms of the
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! GNU General Public License. See the file `License'
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! in the root directory of the present distribution,
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! or http://www.gnu.org/copyleft/gpl.txt .
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!
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!-----------------------------------------------------------------------
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subroutine incdrhous (drhoscf, weight, ik, dbecsum, evcr, wgg, becq, &
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alpq, mode)
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!-----------------------------------------------------------------------
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!
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! This routine computes the change of the charge density due
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! to the displacement of the augmentation charge. Only the
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! smooth part is computed here.
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!
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#include "f_defs.h"
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USE ions_base, ONLY : ntyp => nsp, nat, ityp
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use pwcom
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USE kinds, only : DP
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USE uspp_param, ONLY: nhm, nh
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use phcom
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implicit none
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integer :: ik, mode
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! input: the k point
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! input: the mode which is computed
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real(DP) :: weight, wgg (nbnd, nbnd, nksq)
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! input: the weight of the k point
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! input: the weights
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complex(DP) :: evcr (nrxxs, nbnd), drhoscf (nrxxs), &
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dbecsum(nhm * (nhm + 1) / 2, nat), becq (nkb, nbnd, nksq), &
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alpq (nkb, nbnd, 3, nksq)
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! input: the wavefunctions at k in real
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! output: the change of the charge densi
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! inp/out: the accumulated dbec
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! input: the becp with psi_{k+q}
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! input: the alphap with psi_{k+
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!
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! here the local variable
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!
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real(DP) :: wgt
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! the effective weight of the k point
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complex(DP), allocatable :: ps1 (:,:), dpsir (:)
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! auxiliary space
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! the change of wavefunctions in real sp
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integer :: ibnd, jbnd, nt, na, mu, ih, jh, ikb, jkb, ijkb0, &
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startb, lastb, ipol, ikk, ir, ig
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! counters
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call start_clock ('incdrhous')
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allocate (dpsir( nrxxs))
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allocate (ps1 ( nbnd , nbnd))
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call divide (nbnd, startb, lastb)
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ps1 (:,:) = (0.d0, 0.d0)
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if (lgamma) then
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ikk = ik
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else
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ikk = 2 * ik - 1
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endif
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!
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! Here we prepare the two terms
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!
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ijkb0 = 0
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do nt = 1, ntyp
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do na = 1, nat
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if (ityp (na) == nt) then
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mu = 3 * (na - 1)
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if (abs(u(mu+1,mode)) + abs(u(mu+2,mode)) &
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+ abs(u(mu+3,mode)) > 1.0d-12) then
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do ih = 1, nh (nt)
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ikb = ijkb0 + ih
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do jh = 1, nh (nt)
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jkb = ijkb0 + jh
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do ibnd = 1, nbnd
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do jbnd = startb, lastb
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do ipol = 1, 3
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mu = 3 * (na - 1) + ipol
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ps1(ibnd,jbnd) = ps1(ibnd,jbnd) - qq(ih,jh,nt) * &
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( alphap(ikb,ibnd,ipol,ik) * CONJG(becq(jkb,jbnd,ik)) + &
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becp1(ikb,ibnd,ik) * CONJG(alpq(jkb,jbnd,ipol,ik)) ) * &
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wgg (ibnd, jbnd, ik) * u (mu, mode)
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enddo
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enddo
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enddo
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enddo
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enddo
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endif
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ijkb0 = ijkb0 + nh (nt)
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endif
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enddo
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enddo
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#ifdef __PARA
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call reduce (2 * nbnd * nbnd, ps1)
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#endif
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dpsi (:,:) = (0.d0, 0.d0)
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wgt = 2.d0 * weight / omega
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do ibnd = 1, nbnd_occ (ikk)
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do jbnd = 1, nbnd
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call ZAXPY (npwq, ps1(ibnd,jbnd), evq(1,jbnd), 1, dpsi(1,ibnd), 1)
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enddo
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dpsir(:) = (0.d0, 0.d0)
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do ig = 1, npwq
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dpsir(nls(igkq(ig))) = dpsi (ig, ibnd)
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enddo
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call cft3s (dpsir, nr1s, nr2s, nr3s, nrx1s, nrx2s, nrx3s, + 2)
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do ir = 1, nrxxs
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drhoscf(ir) = drhoscf(ir) + wgt * dpsir(ir) * CONJG(evcr(ir,ibnd))
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enddo
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enddo
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call addusdbec (ik, wgt, dpsi, dbecsum)
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deallocate (ps1)
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deallocate (dpsir)
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call stop_clock ('incdrhous')
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return
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end subroutine incdrhous
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