hf_setup.F90 12.4 KB
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!--------------------------------------------------------------------------------
! Copyright (c) 2016 Peter Grünberg Institut, Forschungszentrum Jülich, Germany
! This file is part of FLEUR and available as free software under the conditions
! of the MIT license as expressed in the LICENSE file in more detail.
!--------------------------------------------------------------------------------
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MODULE m_hf_setup
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CONTAINS
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   SUBROUTINE hf_setup(mpdata, hybinp, input, sym, kpts,  atoms, mpi, noco,nococonv, &
                       cell, oneD, results, jsp, enpara, &
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                       hybdat, l_real, vr0, eig_irr)
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      USE m_types
      USE m_eig66_io
      USE m_util
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      USE m_intgrf
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      USE m_checkolap
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      USE m_hybrid_core
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      USE m_gen_wavf
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      use m_types_hybdat
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      IMPLICIT NONE

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      TYPE(t_mpdata), INTENT(inout)   :: mpdata
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      TYPE(t_hybinp), INTENT(IN) :: hybinp
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      TYPE(t_kpts), INTENT(IN)    :: kpts
      TYPE(t_atoms), INTENT(IN)    :: atoms
      TYPE(t_mpi), INTENT(IN)    :: mpi
      TYPE(t_noco), INTENT(IN)    :: noco
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      TYPE(t_nococonv), INTENT(IN)    :: nococonv
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      TYPE(t_cell), INTENT(IN)    :: cell
      TYPE(t_oneD), INTENT(IN)    :: oneD
      TYPE(t_input), INTENT(IN)    :: input
      TYPE(t_sym), INTENT(IN)    :: sym
      TYPE(t_enpara), INTENT(IN)    :: enpara
      TYPE(t_results), INTENT(INOUT) :: results
      TYPE(t_hybdat), INTENT(INOUT) :: hybdat

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      INTEGER, INTENT(IN)    :: jsp
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      REAL, INTENT(IN)    :: vr0(:, :, :)
      LOGICAL, INTENT(IN)    :: l_real

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      REAL, ALLOCATABLE, INTENT(INOUT)   :: eig_irr(:, :)
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      ! local type variables
      TYPE(t_lapw)             :: lapw
      TYPE(t_mat), ALLOCATABLE :: zmat(:)

      ! local scalars
      INTEGER :: ok, nk, nrec1, i, j, ll, l1, l2, ng, itype, n, l, n1, n2, nn
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      INTEGER :: nbasfcn, n_dim
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      LOGICAL :: l_exist
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      ! local arrays

      REAL, ALLOCATABLE :: basprod(:)
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      INTEGER              :: degenerat(merge(input%neig*2,input%neig,noco%l_soc) + 1, kpts%nkpt)
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      LOGICAL              :: skip_kpt(kpts%nkpt)
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      REAL :: zDebug_r(lapw_dim_nbasfcn,input%neig)
      COMPLEX :: zDebug_c(lapw_dim_nbasfcn,input%neig)
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      skip_kpt = .FALSE.
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      IF (hybdat%l_calhf) THEN
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         ! Preparations for HF and hybinp functional calculation
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         CALL timestart("gen_bz and gen_wavf")
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         allocate(zmat(kpts%nkptf), stat=ok)
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         IF (ok /= 0) call judft_error('eigen_hf: failure allocation z_c')
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         if(.not. allocated(eig_irr)) allocate(eig_irr(input%neig, kpts%nkpt), stat=ok)
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         IF (ok /= 0) call judft_error('eigen_hf: failure allocation eig_irr')
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         eig_irr = 0
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         if(allocated(hybdat%kveclo_eig)) deallocate(hybdat%kveclo_eig)
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         allocate(hybdat%kveclo_eig(atoms%nlotot, kpts%nkpt), stat=ok)
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         IF (ok /= 0) call judft_error('eigen_hf: failure allocation hybdat%kveclo_eig')
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         hybdat%kveclo_eig = 0
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         INQUIRE(file ="z",exist= l_exist)
         IF(l_exist) THEN
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            IF (l_real) OPEN(unit=993,file='z',form='unformatted',access='direct',recl=lapw%dim_nbasfcn()*input%neig*8)
            IF (.NOT.l_real) OPEN(unit=993,file='z',form='unformatted',access='direct',recl=lapw%dim_nbasfcn()*input%neig*16)
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         END IF

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         ! Reading the eig file
         DO nk = 1, kpts%nkpt
            nrec1 = kpts%nkpt*(jsp - 1) + nk
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            CALL lapw%init(input, noco, nococonv,kpts, atoms, sym, nk, cell, sym%zrfs)
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            nbasfcn = MERGE(lapw%nv(1) + lapw%nv(2) + 2*atoms%nlotot, lapw%nv(1) + atoms%nlotot, noco%l_noco)
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            CALL zMat(nk)%init(l_real, nbasfcn, merge(input%neig*2,input%neig,noco%l_soc))
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            CALL read_eig(hybdat%eig_id, nk, jsp, zmat=zMat(nk))
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            IF(l_exist.AND.zmat(1)%l_real) THEN
               READ(993,rec=nk) zDebug_r(:,:)
               zMat(nk)%data_r = 0.0
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               zMat(nk)%data_r(:nbasfcn,:input%neig) = zDebug_r(:nbasfcn,:input%neig)
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            END IF
            IF(l_exist.AND..NOT.zmat(1)%l_real) THEN
               READ(993,rec=nk) zDebug_c(:,:)
               zMat(nk)%data_c = 0.0
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               zMat(nk)%data_c(:nbasfcn,:input%neig) = zDebug_c(:nbasfcn,:input%neig)
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            END IF

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            eig_irr(:, nk) = results%eig(:, nk, jsp)
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            hybdat%ne_eig(nk) = results%neig(nk, jsp)
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         END DO
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         IF(l_exist) CLOSE(993)

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         !Allocate further space
         DO nk = kpts%nkpt + 1, kpts%nkptf
            nbasfcn = zMat(kpts%bkp(nk))%matsize1
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            CALL zMat(nk)%init(l_real, nbasfcn, merge(input%neig*2,input%neig,noco%l_soc))
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         END DO

         !determine degenerate states at each k-point
         !
         ! degenerat(i) =1  band i  is not degenerat ,
         ! degenerat(i) =j  band i  has j-1 degenart states ( i, i+1, ..., i+j)
         ! degenerat(i) =0  band i  is  degenerat, but is not the lowest band
         !                  of the group of degenerate states
         IF (mpi%irank == 0) THEN
            WRITE (6, *)
            WRITE (6, '(A)') "   k-point      |   number of occupied bands  |   maximal number of bands"
         END IF
         degenerat = 1
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         hybdat%nobd(:,jsp) = 0
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         DO nk = 1, kpts%nkpt
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            DO i = 1, hybdat%ne_eig(nk)
               DO j = i + 1, hybdat%ne_eig(nk)
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                  IF (ABS(results%eig(i, nk, jsp) - results%eig(j, nk, jsp)) < 1E-07) THEN !0.015
                     degenerat(i, nk) = degenerat(i, nk) + 1
                  END IF
               END DO
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            END DO

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            DO i = 1, hybdat%ne_eig(nk)
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               IF ((degenerat(i, nk) /= 1) .OR. (degenerat(i, nk) /= 0)) degenerat(i + 1:i + degenerat(i, nk) - 1, nk) = 0
            END DO
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            ! set the size of the exchange matrix in the space of the wavefunctions
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            hybdat%nbands(nk) = hybinp%bands1
            IF (hybdat%nbands(nk) > hybdat%ne_eig(nk)) THEN
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               IF (mpi%irank == 0) THEN
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                  WRITE (*, *) ' maximum for hybdat%nbands is', hybdat%ne_eig(nk)
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                  WRITE (*, *) ' increase energy window to obtain enough eigenvalues'
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                  WRITE (*, *) ' set hybdat%nbands equal to hybdat%ne_eig'
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               END IF
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               hybdat%nbands(nk) = hybdat%ne_eig(nk)
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            END IF

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            DO i = hybdat%nbands(nk) - 1, 1, -1
               IF ((degenerat(i, nk) >= 1) .AND. (degenerat(i, nk) + i - 1 /= hybdat%nbands(nk))) THEN
                  hybdat%nbands(nk) = i + degenerat(i, nk) - 1
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                  EXIT
               END IF
            END DO
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            DO i = 1, hybdat%ne_eig(nk)
               IF (results%w_iks(i, nk, jsp) > 0.0) hybdat%nobd(nk,jsp) = hybdat%nobd(nk,jsp) + 1
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            END DO
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            IF (hybdat%nobd(nk,jsp) > hybdat%nbands(nk)) THEN
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               WRITE (*, *) 'k-point: ', nk
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               WRITE (*, *) 'number of bands:          ', hybdat%nbands(nk)
               WRITE (*, *) 'number of occupied bands: ', hybdat%nobd(nk,jsp)
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               CALL judft_warn("More occupied bands than total no of bands!?")
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               hybdat%nbands(nk) = hybdat%nobd(nk,jsp)
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            END IF
         END DO
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         ! spread hybdat%nobd from IBZ to whole BZ
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         DO nk = 1, kpts%nkptf
            i = kpts%bkp(nk)
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            hybdat%nbands(nk) = hybdat%nbands(i)
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            hybdat%nobd(nk,jsp) = hybdat%nobd(i,jsp)
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         END DO
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         ! generate eigenvectors z and MT coefficients from the previous iteration at all k-points
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         CALL gen_wavf(kpts%nkpt, kpts, sym, atoms, enpara%el0(:, :, jsp), enpara%ello0(:, :, jsp), cell,  &
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                       mpdata, hybinp, vr0, hybdat, noco, nococonv,oneD, mpi, input, jsp, zmat)
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         ! generate core wave functions (-> core1/2(jmtd,hybdat%nindxc,0:lmaxc,ntype) )
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         CALL corewf(atoms, jsp, input,  vr0, hybdat%lmaxcd, hybdat%maxindxc, mpi, &
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                     hybdat%lmaxc, hybdat%nindxc, hybdat%core1, hybdat%core2, hybdat%eig_c)
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         ! check olap between core-basis/core-valence/basis-basis
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         CALL checkolap(atoms, hybdat, mpdata, hybinp, kpts%nkpt, kpts,  mpi, &
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                        input, sym, noco, nococonv,oneD,cell, lapw, jsp)
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         ! set up pointer pntgpt

         ! setup dimension of pntgpt
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         IF(ALLOCATED(hybdat%pntgptd)) DEALLOCATE(hybdat%pntgptd) ! for spinpolarized systems
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         ALLOCATE (hybdat%pntgptd(3))
         hybdat%pntgptd = 0
         DO nk = 1, kpts%nkptf
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            CALL lapw%init(input, noco, nococonv,kpts, atoms, sym, nk, cell, sym%zrfs)
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            do n_dim = 1,3
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               hybdat%pntgptd(n_dim) = MAXVAL([(ABS(lapw%gvec(n_dim,i,jsp)), i=1, lapw%nv(jsp)), hybdat%pntgptd(n_dim)])
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            end do
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         END DO

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         IF(ALLOCATED(hybdat%pntgpt)) DEALLOCATE(hybdat%pntgpt) ! for spinpolarized systems
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         ALLOCATE (hybdat%pntgpt(-hybdat%pntgptd(1):hybdat%pntgptd(1), -hybdat%pntgptd(2):hybdat%pntgptd(2), &
                                 -hybdat%pntgptd(3):hybdat%pntgptd(3), kpts%nkptf), stat=ok)
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         IF (ok /= 0) call judft_error('eigen_hf: failure allocation pntgpt')
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         hybdat%pntgpt = 0
         DO nk = 1, kpts%nkptf
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            CALL lapw%init(input, noco, nococonv,kpts, atoms, sym, nk, cell, sym%zrfs)
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            DO i = 1, lapw%nv(jsp)
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               hybdat%pntgpt(lapw%gvec(1,i,jsp), lapw%gvec(2,i,jsp), lapw%gvec(3,i,jsp), nk) = i
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            END DO
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         END DO
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         allocate(basprod(atoms%jmtd), stat=ok)
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         IF (ok /= 0) call judft_error('eigen_hf: failure allocation basprod')
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         IF(ALLOCATED(hybdat%prodm)) DEALLOCATE(hybdat%prodm)
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         allocate(hybdat%prodm(maxval(mpdata%num_radbasfn), mpdata%max_indx_p_1, 0:maxval(hybinp%lcutm1), atoms%ntype), stat=ok)
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         IF (ok /= 0) call judft_error('eigen_hf: failure allocation hybdat%prodm')
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         basprod = 0; hybdat%prodm = 0; mpdata%l1 = 0; mpdata%l2 = 0
         mpdata%n1 = 0; mpdata%n2 = 0
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         IF(ALLOCATED(hybdat%nindxp1)) DEALLOCATE(hybdat%nindxp1) ! for spinpolarized systems
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         ALLOCATE (hybdat%nindxp1(0:maxval(hybinp%lcutm1), atoms%ntype))
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         hybdat%nindxp1 = 0
         DO itype = 1, atoms%ntype
            ng = atoms%jri(itype)
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            DO l2 = 0, MIN(atoms%lmax(itype), hybinp%lcutwf(itype))
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               ll = l2
               DO l1 = 0, ll
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                  IF (ABS(l1 - l2) <= hybinp%lcutm1(itype)) THEN
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                     DO n2 = 1, mpdata%num_radfun_per_l(l2, itype)
                        nn = mpdata%num_radfun_per_l(l1, itype)
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                        IF (l1 == l2) nn = n2
                        DO n1 = 1, nn
                           ! Calculate all basis-function hybdat%products to obtain
                           ! the overlaps with the hybdat%product-basis functions (hybdat%prodm)
                           basprod(:ng) = (hybdat%bas1(:ng, n1, l1, itype)*hybdat%bas1(:ng, n2, l2, itype) + &
                                           hybdat%bas2(:ng, n1, l1, itype)*hybdat%bas2(:ng, n2, l2, itype))/atoms%rmsh(:ng, itype)
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                           DO l = ABS(l1 - l2), MIN(hybinp%lcutm1(itype), l1 + l2)
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                              IF (MOD(l1 + l2 + l, 2) == 0) THEN
                                 hybdat%nindxp1(l, itype) = hybdat%nindxp1(l, itype) + 1
                                 n = hybdat%nindxp1(l, itype)
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                                 mpdata%l1(n,l,itype) = l1
                                 mpdata%l2(n,l,itype) = l2
                                 mpdata%n1(n,l,itype) = n1
                                 mpdata%n2(n,l,itype) = n2
                                 DO i = 1, mpdata%num_radbasfn(l, itype)
                                    hybdat%prodm(i, n, l, itype) = intgrf(basprod(:ng)*mpdata%radbasfn_mt(:ng, i, l, itype), &
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                                                                          atoms, itype, hybdat%gridf)
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                                 END DO
                              END IF
                           END DO
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                        END DO
                     END DO
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                  END IF
               END DO
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            END DO
         END DO
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         deallocate(basprod)
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         CALL timestop("gen_bz and gen_wavf")
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      ELSE IF (hybinp%l_hybrid) THEN ! hybdat%l_calhf is false
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         !DO nk = n_start,kpts%nkpt,n_stride
         DO nk = 1, kpts%nkpt, 1
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            hybdat%ne_eig(nk) = results%neig(nk, jsp)
            hybdat%nobd(nk,jsp) = COUNT(results%w_iks(:hybdat%ne_eig(nk), nk, jsp) > 0.0)
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         END DO
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         hybdat%maxlmindx = MAXVAL([(SUM([(mpdata%num_radfun_per_l(l, itype)*(2*l + 1), l=0, atoms%lmax(itype))]), itype=1, atoms%ntype)])
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         hybdat%nbands = MIN(hybinp%bands1, input%neig)
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      ENDIF ! hybdat%l_calhf
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   END SUBROUTINE hf_setup
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END MODULE m_hf_setup