quantum-espresso/PH/drhodvus.f90

141 lines
4.4 KiB
Fortran

!
! Copyright (C) 2001-2008 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 drhodvus (irr, imode0, dvscfin, npe)
!-----------------------------------------------------------------------
!
! This subroutine calculates the term of the dynamical matrix
! which comes from the interaction of the change of the self consiste
! potential with the static change of the charge density.
! This term is non zero only if the charge is augmented.
!
!
!
USE kinds, ONLY : DP
USE ions_base, ONLY : nat, ntyp=>nsp, ityp
USE gvect, ONLY : nrxx, nr1, nr2, nr3
USE lsda_mod, ONLY : nspin
USE cell_base, ONLY : omega
USE ions_base, ONLY : nat
USE uspp, ONLY : okvan
USE io_global, ONLY : stdout
USE uspp_param, ONLY : upf, nh
USE paw_variables, ONLY : okpaw
USE noncollin_module, ONLY : nspin_mag
USE modes, ONLY : npert, npertx, nirr
USE dynmat, ONLY : dyn, dyn_rec
USE phus, ONLY : becsumort, int3_paw
USE units_ph, ONLY : iudrhous, lrdrhous
USE mp_global, ONLY : inter_pool_comm, intra_pool_comm
USE mp, ONLY : mp_sum
implicit none
integer :: irr, imode0, npe
! input: the irreducible representation
! input: starting position of this represe
! input: the number of perturbations
complex(DP) :: dvscfin (nrxx, nspin, npe)
! input: the change of V_Hxc
integer :: ipert, irr1, mode0, mu, is, nu_i, nu_j, nrtot, &
ih, jh, ijh, na, nb, nt
! counters
! mode0: starting position of the represention
! nrtot: the total number of mesh points
complex(DP) :: dyn1 (3 * nat, 3 * nat)
! the dynamical matrix
complex(DP), allocatable :: drhous (:,:,:)
! the change of the charge
complex(DP), external :: zdotc
if (.not.okvan) then
dyn_rec=(0.0_DP,0.0_DP)
return
endif
call start_clock ('drhodvus')
allocate (drhous ( nrxx , nspin, npertx))
dyn1 (:,:) = (0.d0, 0.d0)
nrtot = nr1 * nr2 * nr3
mode0 = 0
do irr1 = 1, nirr
do ipert = 1, npert (irr1)
nu_j = mode0 + ipert
call davcio (drhous (1, 1, ipert), lrdrhous, iudrhous, nu_j, - 1)
enddo
do ipert = 1, npert (irr1)
nu_j = mode0 + ipert
do mu = 1, npert (irr)
nu_i = imode0 + mu
do is = 1, nspin_mag
dyn1 (nu_i, nu_j) = dyn1 (nu_i, nu_j) + &
zdotc (nrxx, dvscfin (1,is,mu), 1, drhous (1,is,ipert), 1) &
* omega / DBLE (nrtot)
enddo
enddo
enddo
mode0 = mode0 + npert (irr1)
enddo
deallocate (drhous)
#ifdef __PARA
!
! collect contributions from all pools (sum over k-points)
!
call mp_sum ( dyn1, inter_pool_comm )
call mp_sum ( dyn1, intra_pool_comm )
#endif
!
! PAW contribution: this part of the dynamical matrix is present only
! with PAW. PAW and US dynamical matrices differ only at this point.
!
IF (okpaw) THEN
mode0 = 0
do irr1 = 1, nirr
do ipert = 1, npert (irr1)
nu_j = mode0 + ipert
do mu = 1, npert (irr)
nu_i = imode0 + mu
do nt=1,ntyp
if (upf(nt)%tpawp) then
ijh=0
do ih=1,nh(nt)
do jh=ih,nh(nt)
ijh=ijh+1
do na=1,nat
if (ityp(na)==nt) then
do is = 1, nspin_mag
dyn1(nu_i,nu_j)=dyn1(nu_i,nu_j)+ &
CONJG(int3_paw(ih,jh,mu,na,is))* &
becsumort(ijh,na,is,nu_j)
enddo
endif
enddo
enddo
enddo
endif
enddo
enddo
enddo
mode0 = mode0 + npert (irr1)
enddo
endif
! WRITE( stdout,*) 'drhodvus dyn1, dyn'
! call tra_write_matrix('drhodvus dyn1',dyn1,u,nat)
! call tra_write_matrix('drhodvus dyn',dyn,u,nat)
! call stop_ph(.true.)
dyn (:,:) = dyn (:,:) + dyn1 (:,:)
dyn_rec(:,:) = dyn1(:,:)
call stop_clock ('drhodvus')
return
end subroutine drhodvus