mirror of https://gitlab.com/QEF/q-e.git
177 lines
5.1 KiB
Fortran
177 lines
5.1 KiB
Fortran
!
|
|
! Copyright (C) 2001-2007 Quantum ESPRESSO group
|
|
! This file is distributed under the terms of the
|
|
! GNU General Public License. See the file `License'
|
|
! in the root directory of the present distribution,
|
|
! or http://www.gnu.org/copyleft/gpl.txt .
|
|
!
|
|
!-----------------------------------------------------------------------
|
|
subroutine drhodv (nu_i0, nper, drhoscf)
|
|
!-----------------------------------------------------------------------
|
|
!
|
|
! This subroutine computes the electronic term
|
|
! <psi|dv - e ds|dpsi> of the dynamical matrix.
|
|
! Eq. B35 of PRB 64, 235118 (2001). The contribution of
|
|
! the nonlocal potential is calculated in rhodvnl, the
|
|
! contribution of the local potential in drhodvloc.
|
|
! Note that drhoscf contain only the smooth part of the
|
|
! induced charge density, calculated in solve linter.
|
|
!
|
|
!
|
|
USE kinds, ONLY : DP
|
|
USE ions_base, ONLY : nat
|
|
USE klist, ONLY : xk
|
|
USE gvect, ONLY : g
|
|
USE grid_dimensions, ONLY : nrxx
|
|
USE cell_base, ONLY : tpiba
|
|
USE lsda_mod, ONLY : current_spin, lsda, isk, nspin
|
|
USE wvfct, ONLY : npw, npwx, nbnd, igk
|
|
USE uspp, ONLY : nkb, vkb
|
|
USE becmod, ONLY : calbec, bec_type, becscal, allocate_bec_type, &
|
|
deallocate_bec_type
|
|
USE io_global, ONLY : stdout
|
|
USE noncollin_module, ONLY : noncolin, npol, nspin_mag
|
|
USE io_files, ONLY: iunigk
|
|
|
|
USE dynmat, ONLY : dyn, dyn_rec
|
|
USE modes, ONLY : u
|
|
USE qpoint, ONLY : nksq, npwq, igkq, ikks, ikqs
|
|
USE eqv, ONLY : dpsi
|
|
USE units_ph, ONLY : lrdwf, iuwfc, iudwf
|
|
USE control_ph, ONLY : lgamma
|
|
|
|
USE mp_global, ONLY : inter_pool_comm, intra_pool_comm
|
|
USE mp, ONLY : mp_sum
|
|
|
|
implicit none
|
|
|
|
integer :: nper, nu_i0
|
|
! input: number of perturbations of this represent
|
|
! input: the initial position of the mode
|
|
|
|
complex(DP) :: drhoscf (nrxx, nspin_mag, nper)
|
|
! the change of density due to perturbations
|
|
|
|
integer :: mu, ik, ikq, ig, nu_i, nu_j, na_jcart, ibnd, nrec, &
|
|
ipol, ikk, ipert
|
|
! counters
|
|
! ikk: record position for wfc at k
|
|
|
|
complex(DP) :: fact, ps, dynwrk (3 * nat, 3 * nat), &
|
|
wdyn (3 * nat, 3 * nat), zdotc
|
|
complex(DP), allocatable :: aux (:,:)
|
|
! work space
|
|
|
|
TYPE (bec_type), POINTER :: dbecq(:), dalpq(:,:)
|
|
!
|
|
! Initialize the auxiliary matrix wdyn
|
|
!
|
|
call start_clock ('drhodv')
|
|
|
|
ALLOCATE (dbecq(nper))
|
|
ALLOCATE (dalpq(3,nper))
|
|
DO ipert=1,nper
|
|
call allocate_bec_type ( nkb, nbnd, dbecq(ipert) )
|
|
DO ipol=1,3
|
|
call allocate_bec_type ( nkb, nbnd, dalpq(ipol,ipert) )
|
|
ENDDO
|
|
END DO
|
|
allocate (aux ( npwx*npol , nbnd))
|
|
dynwrk(:,:) = (0.d0, 0.d0)
|
|
wdyn (:,:) = (0.d0, 0.d0)
|
|
!
|
|
! We need a sum over all k points ...
|
|
!
|
|
if (nksq > 1) rewind (unit = iunigk)
|
|
do ik = 1, nksq
|
|
if (nksq > 1) read (iunigk) npw, igk
|
|
ikk = ikks(ik)
|
|
ikq = ikqs(ik)
|
|
if (lgamma) then
|
|
npwq = npw
|
|
else
|
|
if (nksq > 1) read (iunigk) npwq, igkq
|
|
endif
|
|
if (lsda) current_spin = isk (ikk)
|
|
call init_us_2 (npwq, igkq, xk (1, ikq), vkb)
|
|
|
|
do mu = 1, nper
|
|
nrec = (mu - 1) * nksq + ik
|
|
if (nksq > 1 .or. nper > 1) call davcio(dpsi, lrdwf, iudwf, nrec,-1)
|
|
call calbec (npwq, vkb, dpsi, dbecq(mu) )
|
|
do ipol = 1, 3
|
|
aux=(0.d0,0.d0)
|
|
do ibnd = 1, nbnd
|
|
do ig = 1, npwq
|
|
aux (ig, ibnd) = dpsi (ig, ibnd) * &
|
|
(xk (ipol, ikq) + g (ipol, igkq (ig) ) )
|
|
enddo
|
|
if (noncolin) then
|
|
do ig = 1, npwq
|
|
aux (ig+npwx, ibnd) = dpsi (ig+npwx, ibnd) * &
|
|
(xk (ipol, ikq) + g (ipol, igkq (ig) ) )
|
|
enddo
|
|
endif
|
|
enddo
|
|
call calbec (npwq, vkb, aux, dalpq(ipol,mu) )
|
|
enddo
|
|
enddo
|
|
fact = CMPLX(0.d0, tpiba,kind=DP)
|
|
DO ipert=1,nper
|
|
DO ipol=1,3
|
|
CALL becscal(fact,dalpq(ipol,ipert),nkb,nbnd)
|
|
ENDDO
|
|
ENDDO
|
|
call drhodvnl (ik, ikk, nper, nu_i0, dynwrk, dbecq, dalpq)
|
|
enddo
|
|
!
|
|
! put in the basis of the modes
|
|
!
|
|
do nu_i = 1, 3 * nat
|
|
do nu_j = 1, 3 * nat
|
|
ps = (0.0d0, 0.0d0)
|
|
do na_jcart = 1, 3 * nat
|
|
ps = ps + dynwrk (nu_i, na_jcart) * u (na_jcart, nu_j)
|
|
enddo
|
|
wdyn (nu_i, nu_j) = wdyn (nu_i, nu_j) + ps
|
|
enddo
|
|
|
|
enddo
|
|
#ifdef __PARA
|
|
!
|
|
! collect contributions from all pools (sum over k-points)
|
|
!
|
|
call mp_sum ( wdyn, inter_pool_comm )
|
|
#endif
|
|
!
|
|
! add the contribution of the local part of the perturbation
|
|
!
|
|
call drhodvloc (nu_i0, nper, drhoscf, wdyn)
|
|
!
|
|
! add to the rest of the dynamical matrix
|
|
!
|
|
! WRITE( stdout,*) 'drhodv dyn, wdyn'
|
|
! call tra_write_matrix('drhodv dyn',dyn,u,nat)
|
|
! call tra_write_matrix('drhodv wdyn',wdyn,u,nat)
|
|
|
|
dyn (:,:) = dyn (:,:) + wdyn (:,:)
|
|
dyn_rec(:,:) = dyn_rec(:,:) + wdyn(:,:)
|
|
|
|
deallocate (aux)
|
|
|
|
do ipert=1,nper
|
|
do ipol=1,3
|
|
call deallocate_bec_type ( dalpq(ipol,ipert) )
|
|
enddo
|
|
end do
|
|
deallocate (dalpq)
|
|
do ipert=1,nper
|
|
call deallocate_bec_type ( dbecq(ipert) )
|
|
end do
|
|
deallocate(dbecq)
|
|
|
|
|
|
call stop_clock ('drhodv')
|
|
return
|
|
end subroutine drhodv
|