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quantum-espresso/PHonon/PH/q2qstar.f90

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!
! Copyright (C) 2001-2012 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 .
!
!
! A small utility that reads the first q from a dynamical matrix file (either xml or plain text),
! recomputes the system symmetry (starting from the lattice) and generates the star of q.
!
! Useful for debugging and for producing the star of the wannier-phonon code output.
!
! Syntax:
! q2qstar.x filein [fileout]
!
! fileout default: rot_filein (old format) or rot_filein.xml (new format)
!
!----------------------------------------------------------------------------
PROGRAM Q2QSTAR
!----------------------------------------------------------------------------
!
USE kinds, ONLY : DP
USE constants, ONLY : amu_ry
USE parameters, ONLY : ntypx
USE mp, ONLY : mp_bcast
USE mp_global, ONLY : mp_startup, mp_global_end
USE mp_world, ONLY : world_comm
USE io_global, ONLY : ionode_id, ionode, stdout
USE environment, ONLY : environment_start, environment_end
! symmetry
USE symm_base, ONLY : s, invs, nsym, find_sym, set_sym_bl, irt, copy_sym, nrot, inverse_s
! for reading the dyn.mat.
USE cell_base, ONLY : at, bg, celldm, ibrav, omega
USE ions_base, ONLY : nat, ityp, ntyp => nsp, atm, tau, amass
! as above, unused here
USE control_ph, ONLY : xmldyn
USE noncollin_module, ONLY : m_loc, nspin_mag
!
USE dynmat, ONLY : w2
!
! for non-xml file only:
USE dynamicalq, ONLY : dq_phiq => phiq, dq_tau => tau, dq_ityp => ityp, zeu
! fox xml files only
USE io_dyn_mat, ONLY : read_dyn_mat_param, read_dyn_mat_header, &
read_dyn_mat, read_dyn_mat_tail, &
write_dyn_mat_header
! small group symmetry
USE lr_symm_base, ONLY : rtau, nsymq, minus_q, irotmq, gi, gimq
!
IMPLICIT NONE
!
CHARACTER(len=7),PARAMETER :: CODE="Q2QSTAR"
CHARACTER(len=256) :: fildyn, filout
INTEGER :: ierr, nargs
!
INTEGER :: nqs, isq (48), imq, nqq
REAL(DP) :: sxq(3, 48), xq(3), xqs(3,48), epsil(3,3)
!
LOGICAL :: sym(48), lrigid
LOGICAL, EXTERNAL :: has_xml
!
COMPLEX(DP),ALLOCATABLE :: phi(:,:,:,:), d2(:,:)
INTEGER :: i,j, icar,jcar, na,nb
!
!NAMELIST / input / fildyn
!
CALL mp_startup()
CALL environment_start(CODE)
!
nargs = command_argument_count()
IF(nargs < 1) CALL errore(CODE, 'Argument is missing! Syntax: "q2qstar dynfile [outfile]"', 1)
!
CALL get_command_argument(1, fildyn)
CALL mp_bcast(fildyn, ionode_id,world_comm)
!
! check input
IF (fildyn == ' ') CALL errore (CODE,' bad fildyn',1)
xmldyn=has_xml(fildyn)
!
! set up output
IF (nargs > 1) THEN
CALL get_command_argument(2, filout)
ELSE
filout = "rot_"//TRIM(fildyn)
ENDIF
CALL mp_bcast(filout, ionode_id,world_comm)
!
! ######################### reading #########################
XML_FORMAT_READ : &
IF (xmldyn) THEN
! read params
CALL read_dyn_mat_param(fildyn,ntyp,nat)
ALLOCATE(m_loc(3,nat))
ALLOCATE(tau(3,nat))
ALLOCATE(ityp(nat))
ALLOCATE(zeu(3,3,nat))
ALLOCATE(phi(3,3,nat,nat))
! read system information
CALL read_dyn_mat_header(ntyp, nat, ibrav, nspin_mag, &
celldm, at, bg, omega, atm, amass, tau, ityp, &
m_loc, nqs, lrigid, epsil, zeu )
! read dyn.mat.
CALL read_dyn_mat(nat,1,xq,phi)
! close file
CALL read_dyn_mat_tail(nat)
!
ELSE XML_FORMAT_READ
! open file
IF (ionode)OPEN (unit=1, file=fildyn,status='old',form='formatted',iostat=ierr)
CALL mp_bcast(ierr, ionode_id,world_comm)
IF (ierr /= 0) CALL errore(CODE,'file '//TRIM(fildyn)//' missing!',1)
! read everything, this use global variables
ntyp = ntypx
CALL read_dyn_from_file (nqs, xqs, epsil, lrigid, &
ntyp, nat, ibrav, celldm, at, atm, amass)
!
IF (ionode) CLOSE(unit=1)
!
xq = xqs(:,1)
ALLOCATE(phi(3,3,nat,nat))
ALLOCATE(tau(3,nat))
ALLOCATE(ityp(nat))
phi = dq_phiq(:,:,:,:,1)
tau = dq_tau
ityp = dq_ityp
!zeu = dq_zeu ! note: zeu from dynamicalq is a real(dp) array, zeu from control_ph is a flag (logical)
amass = amass/amu_ry
!
ENDIF XML_FORMAT_READ
!
! regenerate the lattice
CALL latgen(ibrav,celldm,at(1,1),at(1,2),at(1,3),omega)
at = at / celldm(1) ! bring at in units of alat
CALL volume(celldm(1),at(1,1),at(1,2),at(1,3),omega)
CALL recips(at(1,1),at(1,2),at(1,3),bg(1,1),bg(1,2),bg(1,3))
!
! IF( nqs > 1) CALL errore(CODE, 'This code can in principle read dyn.mat. with the star of q, but it makes no sense', 1)
WRITE(stdout,'(//,5x,a,3f14.9/)') "Dynamical matrix at q =", xq
!
! ######################### symmetry setup #########################
! ~~~~~~~~ setup bravais lattice symmetry ~~~~~~~~
CALL set_sym_bl ( )
WRITE(stdout, '(5x,a,i3)') "Symmetries of bravais lattice: ", nrot
!
! ~~~~~~~~ setup crystal symmetry ~~~~~~~~
IF(.not.allocated(m_loc)) THEN
ALLOCATE(m_loc(3,nat))
m_loc = 0._dp
ENDIF
CALL find_sym ( nat, tau, ityp, .false., m_loc )
WRITE(stdout, '(5x,a,i3)') "Symmetries of crystal: ", nsym
!
! ~~~~~~~~ setup small group of q symmetry ~~~~~~~~
! part 1: call smallg_q and the copy_sym,
minus_q = .true.
sym = .false.
sym(1:nsym) = .true.
CALL smallg_q(xq, 0, at, bg, nsym, s, sym, minus_q)
nsymq = copy_sym(nsym, sym)
! recompute the inverses as the order of sym.ops. has changed
CALL inverse_s ( )
! part 2: this computes gi, gimq
call set_giq (xq,s,nsymq,nsym,irotmq,minus_q,gi,gimq)
WRITE(stdout, '(5x,a,i3)') "Symmetries of small group of q:", nsymq
IF(minus_q) WRITE(stdout, '(10x,a)') "in addition sym. q -> -q+G:"
!
! finally this does some of the above again and also computes rtau...
ALLOCATE(rtau( 3, 48, nat))
CALL sgam_lr(at, bg, nsym, s, irt, tau, rtau, nat)
!
! ######################### star of q #########################
do na = 1, nat
do nb = 1, nat
call trntnsc (phi (1, 1, na, nb), at, bg, - 1)
enddo
enddo
CALL symdynph_gq_new (xq, phi, s, invs, rtau, irt, nsymq, nat, &
irotmq, minus_q)
do na = 1, nat
do nb = 1, nat
call trntnsc (phi (1, 1, na, nb), at, bg, + 1)
enddo
enddo
!
CALL star_q(xq, at, bg, nsym, s, invs, nqs, sxq, isq, imq, .true. )
!
XML_FORMAT_WRITE : &
IF (xmldyn) THEN
nqq=nqs
IF (imq==0) nqq=2*nqs
! IF (lgamma.AND.done_epsil.AND.done_zeu) THEN
! CALL write_dyn_mat_header( fildyn, ntyp, nat, ibrav, nspin_mag, &
! celldm, at, bg, omega, atm, amass, tau, ityp, m_loc, &
! nqq, epsilon, zstareu, lraman, ramtns)
! ELSE
CALL write_dyn_mat_header( filout, ntyp, nat, ibrav, nspin_mag, &
celldm, at, bg, omega, atm, amass, tau,ityp,m_loc,nqq)
! ENDIF
ELSE XML_FORMAT_WRITE
OPEN (unit=1, file=filout,status='unknown',form='formatted',iostat=ierr)
IF (ierr /= 0) CALL errore(CODE,'opening output file',1)
CALL write_old_dyn_mat_head(1)
ENDIF XML_FORMAT_WRITE
!
! repack phi to 3*nat,3*nat so that it can be repacked and then rerepacked again in q2qstar_ph
ALLOCATE(d2(3*nat, 3*nat))
DO i = 1, 3 * nat
na = (i - 1) / 3 + 1
icar = i - 3 * (na - 1)
DO j = 1, 3 * nat
nb = (j - 1) / 3 + 1
jcar = j - 3 * (nb - 1)
d2 (i, j) = phi(icar, jcar, na, nb)
ENDDO
ENDDO
!
CALL q2qstar_ph (d2, at, bg, nat, nsym, s, invs, irt, rtau, &
nqs, sxq, isq, imq, 1)
ALLOCATE(w2(3*nat))
CALL dyndia (xq, 3*nat, nat, ntyp, ityp, amass, 1, d2, w2)
IF (.not.xmldyn) THEN
WRITE(1, '(/,3a,/)') "File generated with q2qstar.x from '", TRIM(fildyn), "'" ! <-- to prevent crash with old versions of q2r.x
CLOSE(1)
ENDIF
!
DEALLOCATE(phi, d2, w2)
DEALLOCATE(rtau, tau, ityp)
IF( .not.xmldyn ) DEALLOCATE(dq_phiq, dq_tau, dq_ityp, zeu) ! from read_dyn_from_file
IF( xmldyn) DEALLOCATE(zeu, m_loc)
DEALLOCATE(irt) ! from symm_base
!----------------------------------------------------------------------------
END PROGRAM Q2QSTAR
!----------------------------------------------------------------------------
!
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