!==============================================================================!
!
! Copyright (C) 2001-2010 PWSCF 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 orbm_kubo()
  !-------------------------------------------------------------------------
  !! This routine is used to calculate the Kubo terms of orbital 
  !! magnetization (in SI, i.e., A/m).
  !
  !! Written by Andrei Malashevich at UC Berkeley.
  !
  !! For details see:  
  !! New. J. Phys. 12, 053032 (2010)  
  !! Many parts from \(textrm{bp_c_phase.f90}\) and 
  !! \(textrm{h_epsi_her_set.f90}\) are reused.
  !
  !! NOTE: in order to compute Kubo terms one must first perform a usual SCF 
  !! calculation, then NSCF calculation with flag lorbm=.TRUE. (in the 
  !! "control" section) using a UNIFORM grid of k-points.
  !
  USE ener,                 ONLY : ef
  USE kinds,                ONLY : DP
  USE io_global,            ONLY : stdout
  USE io_files,             ONLY : iunwfc, nwordwfc
  USE buffers,              ONLY : get_buffer
  USE noncollin_module,     ONLY : noncolin, npol
  USE wvfct,                ONLY : npwx, nbnd, et, current_k
  USE lsda_mod,             ONLY : nspin
  USE fft_base,             ONLY : dfftp
  USE gvect,                ONLY : ngm, ngm_g, g, gcutm, ig_l2g
  USE start_k,              ONLY : nk1, nk2, nk3
  USE klist,                ONLY : nks, xk, ngk, igk_k
  USE cell_base,            ONLY : tpiba, gpar=>bg, at, alat, omega
  USE mp,                   ONLY : mp_sum, mp_barrier
  USE constants,            ONLY : pi, tpi, rytoev
  USE bp,                   ONLY : lelfield, mapgp_global, mapgm_global, nx_el
  USE becmod,               ONLY : bec_type, becp, calbec, &
                                   allocate_bec_type, deallocate_bec_type
  USE uspp,                 ONLY : nkb, vkb
  USE scf,                  ONLY : vrs, vltot, v, kedtau
  USE gvecs,                ONLY : doublegrid
  USE mp_pools,             ONLY : intra_pool_comm
  USE mp_world,             ONLY : world_comm
  !
  IMPLICIT NONE
  !
  COMPLEX(DP), ALLOCATABLE :: evc_k(:,:)  !for wavefunctios at k
  COMPLEX(DP), ALLOCATABLE :: evc_kp(:,:) !for wavefunctios at k'
  COMPLEX(DP), ALLOCATABLE :: aux_k(:)
  COMPLEX(DP), ALLOCATABLE :: aux_kp(:)
  COMPLEX(DP), ALLOCATABLE :: aux_kp_g(:)
  COMPLEX(DP), ALLOCATABLE :: evcpm(:,:,:)
  COMPLEX(DP), ALLOCATABLE :: H_evc(:,:)
  COMPLEX(DP), ALLOCATABLE :: temp(:),temp2(:)
  COMPLEX(DP) :: store1, store2
  COMPLEX(DP) :: sca
  ! map g-space global to g-space k-point dependent
  INTEGER, ALLOCATABLE :: ln(:,:,:)
  INTEGER, ALLOCATABLE  :: map_g(:)
  INTEGER :: i,j,k,n,np          ! Numbering of k-points
  ! np (n') is used in the loop over neigboring k-points
  INTEGER :: signum
  INTEGER :: tmp
  INTEGER :: ipol ! from 1 to npol
  INTEGER :: istart, iend ! ranges of some arrays
  LOGICAL :: inbz(6)        ! if true k' is in BZ
  REAL(DP) :: gtr(3)                      ! G+G_0
  INTEGER :: npw_k, npw_kp
  INTEGER :: igk_kp(npwx)
  INTEGER :: nb, mb
  INTEGER :: ig
  INTEGER :: n1,n2,n3,ng
  COMPLEX(DP) :: mat(nbnd,nbnd)
  REAL(DP) :: eps ! small number
  ! For matrix inversion (zgedi)
  INTEGER :: ivpt(nbnd)
  INTEGER :: info
  COMPLEX(DP) :: cdet(2)
  COMPLEX(DP) :: cdwork(nbnd)
  REAL(DP) :: mlc(3),mic(3)     ! orbital magnetization (LC and IC terms)
  INTEGER :: kpt_arr(3) ! k-point mesh
  INTEGER :: eps_i(3) ! these play role of the antisymmetric tensor e_ijk
  INTEGER :: eps_j(3)
  INTEGER :: sig, sigp
  INTEGER :: l
  REAL(DP) :: pref    !                        prefactor for MAGNETIZATION in SI
  REAL(DP) :: pref_bm ! prefactor for MAGNETIC MOMENT per cell in Bohr magnetons
  REAL(DP) :: pbm     ! prefactor for MAGNETIC MOMENT per cell in Bohr magnetons
  REAL(DP), PARAMETER :: el_si=1.60217646E-19             ! electron charge (SI)
  REAL(DP), PARAMETER :: hbar_si=1.054571628E-34                     ! hbar (SI)
  REAL(DP), PARAMETER :: bohr_si=5.2917720859E-11             ! Bohr radius in m
  REAL(DP), PARAMETER :: ry_si=2.179871993E-18           ! Rydberg in J (energy)
  REAL(DP), PARAMETER :: ry_ev=13.6056923               ! Rydberg in eV (energy)
  LOGICAL :: store_flag
  INTEGER :: nbr(6)                             ! map for 6 neighboring k-points
  !
  ALLOCATE( evc_k(npwx*npol,nbnd)  )
  ALLOCATE( evc_kp(npwx*npol,nbnd) )
  ALLOCATE( map_g(npwx) )
  ALLOCATE( ln(-dfftp%nr1:dfftp%nr1,-dfftp%nr2:dfftp%nr2,-dfftp%nr3:dfftp%nr3) )
  ALLOCATE( aux_k(ngm*npol)  )
  ALLOCATE( aux_kp(ngm*npol) )
  ALLOCATE( evcpm(npol*npwx,nbnd,6) )
  ALLOCATE( H_evc(npol*npwx,nbnd)   )
  ALLOCATE( temp(ngm) )
  !
  CALL set_vrs( vrs, vltot, v%of_r, kedtau, v%kin_r, dfftp%nnr, nspin, doublegrid )
  CALL allocate_bec_type( nkb, nbnd, becp )
  ! Initializations
  !
  ! Define small number
  eps = 1.0d-6
  !
  mlc = 0.0d0
  mic = 0.0d0
  !
  kpt_arr(1) = nk1
  kpt_arr(2) = nk2
  kpt_arr(3) = nk3
  !
  eps_i(1) = 2
  eps_i(2) = 3
  eps_i(3) = 1
  eps_j(1) = 3
  eps_j(2) = 1
  eps_j(3) = 2
  !
  ! convert energy from Ry to J
  ! alat is in a.u. (Bohr) need to convert to SI
  pref = ry_si*el_si/hbar_si/4.0_dp/(tpi**3)*tpiba/bohr_si
  !
  ! magnetic moment in Bohr magnetons
  ! need to multiply by unit-cell volume omega
  ! convert Ry to Ha by dividing by 2.0
  ! Bohr magneton in a.u. is 1/2
  ! so these two factors cancel out
  ! e=hbar=1 so forget about it
  ! the rest is in atomic units already
  pref_bm = omega/4.0_dp/(tpi**3)*tpiba
  pbm = pref_bm/pref
  !
  !--- Recalculate FFT correspondence (see ggen.f90) ---
  ln = 0
  DO ng = 1, ngm
    n1 = NINT( g(1,ng)*at(1,1) + g(2,ng)*at(2,1) + g(3,ng)*at(3,1) )
    n2 = NINT( g(1,ng)*at(1,2) + g(2,ng)*at(2,2) + g(3,ng)*at(3,2) )
    n3 = NINT( g(1,ng)*at(1,3) + g(2,ng)*at(2,3) + g(3,ng)*at(3,3) )
    ln(n1,n2,n3) = ng
  ENDDO
  !
  DO i=1,nk1  ! x
    DO j=1,nk2 ! y
      DO k=1,nk3 ! z
        ! Consecutive ordering of k-points
        n = (k-1) + (j-1)*nk3 + (i-1)*nk2*nk3 + 1
        !
        ! Read wavefunction at k
        CALL get_buffer( evc_k, nwordwfc, iunwfc, n )
        ! set current k-point (n), recompute projectors, kinetic energy
        ! needed by h_psi
        npw_k = ngk(n)
        current_k = n
        CALL init_us_2( npw_k, igk_k(1,n), xk(1,n), vkb )
        CALL g2_kin( n )
        !
        evcpm = (0.0d0,0.0d0)
        !
        !====================================================!
        !=== Compute dual vectors ===========================!
        !====================================================!
        !
        inbz = .FALSE.
        ! Find indices of neighboring k-points
        ! Current point
        ! n = (k-1) + (j-1)*nk3 + (i-1)*nk2*nk3 + 1
        !
        ! k'=k-dx
        IF (i>1) THEN
          !np = (k-1) + (j-1)*nk3 + (i-2)*nk2*nk3 + 1
          nbr(1) = n-nk2*nk3
          inbz(1) = .TRUE.
        ELSE
          !np = (k-1) + (j-1)*nk3 + (nk1-1)*nk2*nk3 + 1
          nbr(1) = n+(nk1-1)*nk2*nk3
        ENDIF
        ! k'=k+dx
        IF (i<nk1) THEN
          !np = (k-1) + (j-1)*nk3 + i*nk2*nk3 + 1
          nbr(2) = n+nk2*nk3
          inbz(2) = .TRUE.
        ELSE
          !np = (k-1) + (j-1)*nk3 + 1
          nbr(2) = n-(nk1-1)*nk2*nk3
        ENDIF
        ! k'=k-dy
        IF (j>1) THEN
          !np = (k-1) + (j-2)*nk3 + (i-1)*nk2*nk3 + 1
          nbr(3) = n-nk3
          inbz(3) = .TRUE.
        ELSE
          !np = (k-1) + (nk2-1)*nk3 + (nk1-1)*nk2*nk3 + 1
          nbr(3) = n+(nk2-1)*nk3
        ENDIF
        ! k'=k+dy
        IF (j<nk2) THEN
          !np = (k-1) + j*nk3 + (i-1)*nk2*nk3 + 1
          nbr(4) = n+nk3
          inbz(4) = .TRUE.
        ELSE
          !np = (k-1) + (i-1)*nk2*nk3 + 1
          nbr(4) = n-(nk2-1)*nk3
        ENDIF
        ! k'=k-dz
        IF (k>1) THEN
          !np = (k-2) + (j-1)*nk3 + (i-1)*nk2*nk3 + 1
          nbr(5) = n-1
          inbz(5) = .TRUE.
        ELSE
          !np = (nk3-1) + (j-1)*nk3 + (i-1)*nk2*nk3 + 1
          nbr(5) = n+(nk3-1)
        ENDIF
        ! k'=k+dz
        IF (k<nk3) THEN
          !np = k + (j-1)*nk3 + (i-1)*nk2*nk3 + 1
          nbr(6) = n+1
          inbz(6) = .TRUE.
        ELSE
          !np = (j-1)*nk3 + (i-1)*nk2*nk3 + 1
          nbr(6) = n-(nk3-1)
        ENDIF
        ! NOTE: nbr(5) and nbr(6) are neighbors along z 
        !       and require special treatment in parallel case
        !
        ! loop over neighbors
        signum=1
        !
        DO np = 1, 6
          !
          signum = -signum
          !
          npw_kp = ngk(nbr(np))
          igk_kp(:)= igk_k(:,nbr(np))
          CALL get_buffer( evc_kp, nwordwfc, iunwfc, nbr(np) )
          !
          ! Calculate S-1(k,k-dx)
          !
          ! --- Matrix elements calculation ---
          mat = (0.d0,0.d0)
          !
          IF (inbz(np)) THEN
            !
            DO nb = 1, nbnd
              DO mb = 1, nbnd
                !
                aux_k = (0.d0,0.d0)
                aux_kp = (0.d0,0.d0)
                !
                DO ipol = 1, npol
                  !
                  istart = (ipol-1)*npwx+1
                  iend = istart+npw_k-1
                  aux_k(igk_k(1:npw_k,n)+ngm*(ipol-1)) = evc_k(istart:iend,nb)
                  !
                  iend = istart+npw_kp-1
                  aux_kp(igk_kp(1:npw_kp)+ngm*(ipol-1)) = evc_kp(istart:iend,mb)
                  !
                ENDDO
                !
                mat(nb,mb) = dot_product( aux_k(1:ngm*npol), aux_kp(1:ngm*npol) )
                !
              ENDDO
            ENDDO
            !
            CALL mp_sum( mat, intra_pool_comm )
            !
          ELSE ! (.not. inbz)
            !
            IF ((ngm==ngm_g).OR.(np>4)) THEN ! regular treatment, same for serial and parallel
              map_g = 0
              DO ig = 1, npw_kp
                !
                !--- If k'=k+G_o, the relation psi_k+G_o (G-G_o) ---
                !--- = psi_k(G) is used, gpar=G_o, gtr = G-G_o ---
                !--- or psi_k'(G)=psi_k(G+G_0)
                ! np=1,3,5 sign "+"
                ! np=2,4,6 sign "-" (use signum for this purpose)
                ! np=1,2 gpar(:,1)
                ! np=3,4 gpar(:,2)
                ! np=5,6 gpar(:,3) 
                ! (use (np+1)/2 for this purpose, note integer arithmetic)
                gtr(1) = g(1,igk_kp(ig)) - DBLE(signum) * gpar(1,(np+1)/2)
                gtr(2) = g(2,igk_kp(ig)) - DBLE(signum) * gpar(2,(np+1)/2)
                gtr(3) = g(3,igk_kp(ig)) - DBLE(signum) * gpar(3,(np+1)/2)
                !
                !--- Find crystal coordinates of gtr, n1,n2,n3 ---
                !--- and the position ng in the ngm array ---
                IF (gtr(1)**2+gtr(2)**2+gtr(3)**2 <= gcutm) THEN
                  n1 = NINT(gtr(1)*at(1,1) + gtr(2)*at(2,1) + gtr(3)*at(3,1))
                  n2 = NINT(gtr(1)*at(1,2) + gtr(2)*at(2,2) + gtr(3)*at(3,2))
                  n3 = NINT(gtr(1)*at(1,3) + gtr(2)*at(2,3) + gtr(3)*at(3,3))
                  ng = ln(n1,n2,n3)
                  !
                  IF ((ABS(g(1,ng)-gtr(1)) > eps) .OR. &
                      (ABS(g(2,ng)-gtr(2)) > eps) .OR. &
                      (ABS(g(3,ng)-gtr(3)) > eps)) THEN
                    WRITE(6,*) ' error hepsiher: translated G=', &
                      gtr(1),gtr(2),gtr(3), &
                      ' with crystal coordinates',n1,n2,n3, &
                      ' corresponds to ng=',ng,' but G(ng)=', &
                      g(1,ng),g(2,ng),g(3,ng)
                    WRITE(6,*) ' probably because G_par is NOT', &
                      ' a reciprocal lattice vector '
                    !WRITE(6,*) 'DBGG: n,np=',n,np
                    STOP
                  ENDIF
                ELSE
                  WRITE(6,*) ' |gtr| > gcutm  for gtr=', &
                    gtr(1),gtr(2),gtr(3)
                  STOP
                ENDIF
                map_g(ig) = ng
                !
              ENDDO
              !
            ENDIF ! regular treatment
            !
            DO mb=1,nbnd
              !
              IF((ngm==ngm_g).OR.(np>4)) THEN ! regular treatment, same for serial and parallel
                !
                DO nb=1,nbnd
                  aux_k=(0.d0,0.d0)
                  aux_kp=(0.d0,0.d0)
                  !
                  DO ipol=1,npol
                    istart = (ipol-1)*npwx+1
                    iend = istart+npw_k-1
                    aux_k(igk_k(1:npw_k,n)+ngm*(ipol-1))=evc_k(istart:iend,nb)
                    !
                    iend = istart+npw_kp-1
                    aux_kp(map_g(1:npw_kp)+ngm*(ipol-1))=evc_kp(istart:iend,mb)
                  ENDDO
                  !
                  mat(nb,mb) = dot_product(aux_k(1:ngm*npol),aux_kp(1:ngm*npol))
                  !
                ENDDO
                !
              ELSE ! Special parallel treatment
                   ! allocate global array
                ALLOCATE(aux_kp_g(ngm_g*npol))
                aux_kp_g=(0.0d0,0.0d0)
                DO ipol=1,npol
                  istart = (ipol-1)*npwx+1
                  iend = istart+npw_kp-1
                  IF(np==1) THEN
                    aux_kp_g(mapgp_global(ig_l2g(igk_kp(1:npw_kp)),1)+ngm_g*(ipol-1))= &
                       evc_kp(istart:iend,mb)
                  ENDIF
                  IF(np==2) THEN
                    aux_kp_g(mapgm_global(ig_l2g(igk_kp(1:npw_kp)),1)+ngm_g*(ipol-1))= &
                      evc_kp(istart:iend,mb)
                  ENDIF
                  IF(np==3) THEN
                    aux_kp_g(mapgp_global(ig_l2g(igk_kp(1:npw_kp)),2)+ngm_g*(ipol-1))= &
                      evc_kp(istart:iend,mb)
                  ENDIF
                  IF(np==4) THEN
                    aux_kp_g(mapgm_global(ig_l2g(igk_kp(1:npw_kp)),2)+ngm_g*(ipol-1))= &
                      evc_kp(istart:iend,mb)
                  ENDIF
                ENDDO
                !
                CALL mp_sum( aux_kp_g(:), world_comm )
                !
                DO nb = 1, nbnd
                  sca = (0.0d0,0.0d0)
                  DO ipol = 1, npol
                    DO ig = 1, npw_k
                      sca = sca + CONJG(evc_k(ig+npwx*(ipol-1),nb))*&
                              aux_kp_g(ig_l2g(igk_k(ig,n))+ngm_g*(ipol-1))
                    ENDDO
                  ENDDO
                  mat(nb,mb) = sca
                ENDDO
                !
                DEALLOCATE(aux_kp_g)
                !
              ENDIF ! parallel treatment
              !
            ENDDO
            !
            CALL mp_sum( mat, intra_pool_comm )
            !
          ENDIF
          !
          !--- Calculate matrix inverse ---
          CALL zgefa( mat, nbnd, nbnd, ivpt, info )
          CALL errore( 'orbm_kubo', 'error in zgefa', ABS(info))
          CALL zgedi( mat, nbnd, nbnd, ivpt, cdet, cdwork, 1)
          !
          DO nb = 1, nbnd
            DO ipol = 1, npol
              temp = (0.0d0,0.0d0)
              istart = (ipol-1)*npwx+1
              iend = istart+npw_kp-1
              ! map_g is needed only if kp is outside of BZ
              ! otherwise use igk_kp
              IF (inbz(np)) THEN
                temp(igk_kp(1:npw_kp)) = evc_kp(istart:iend,nb)
              ELSE
                IF((ngm==ngm_g).OR.(np>4)) THEN ! regular treatment
                  temp(map_g(1:npw_kp))=evc_kp(istart:iend,nb)
                ELSE ! map_g is not defined
                  ALLOCATE(temp2(ngm_g))
                  temp2=(0.0d0,0.0d0) !playing role of temp above
                  IF(np==1) THEN
                    temp2(mapgp_global(ig_l2g(igk_kp(1:npw_kp)),1))=&
                      evc_kp(istart:iend,nb)
                  END IF
                  IF(np==2) THEN
                    temp2(mapgm_global(ig_l2g(igk_kp(1:npw_kp)),1))=&
                      evc_kp(istart:iend,nb)
                  END IF
                  IF(np==3) THEN
                    temp2(mapgp_global(ig_l2g(igk_kp(1:npw_kp)),2))=&
                      evc_kp(istart:iend,nb)
                  END IF
                  IF (np==4) THEN
                    temp2(mapgm_global(ig_l2g(igk_kp(1:npw_kp)),2))=&
                      evc_kp(istart:iend,nb)
                  ENDIF
                  CALL mp_sum( temp2(:), world_comm )
                ENDIF
              ENDIF
              !
              iend = istart + npw_k - 1
              !
              DO mb = 1, nbnd
                IF(inbz(np).OR.(np>4).OR.(ngm==ngm_g)) THEN
                  evcpm(istart:iend,mb,np) = evcpm(istart:iend,mb,np) + &
                              mat(nb,mb)*temp(igk_k(1:npw_k,n))
                ELSE ! special parallel case
                  evcpm(istart:iend,mb,np) = evcpm(istart:iend,mb,np) + &
                              mat(nb,mb)*temp2(ig_l2g(igk_k(1:npw_k,n)))
                ENDIF
              ENDDO
              IF (ALLOCATED(temp2)) DEALLOCATE( temp2 )
            ENDDO
          ENDDO
          !
        ENDDO ! loop over neighbors
        !
        !====================================================!
        !=== Compute orbital magnetization ==================!
        !====================================================!
        npw_kp = ngk(nbr(1))
        igk_kp(:) = igk_k(:,nbr(1))
        !
        ! LC TERM
        !
        DO l = 1, 3 ! loop over gpar's
          DO sig = 0, 1 ! i -/+
            DO sigp = 0, 1 ! j -/+
              IF (sig==sigp) THEN
                signum = 1
              ELSE
                signum = -1
              ENDIF
              !
              ! H | u_{nk j sigp} >
              H_evc = (0.0d0,0.0d0)
              store_flag = lelfield
              lelfield = .FALSE.
              CALL h_psi( npwx, npw_k, nbnd, evcpm(:,:,2*eps_j(l)+sigp-1), H_evc )
              lelfield = store_flag
              !
              DO nb = 1, nbnd ! loop over bands
                  mlc = mlc + DBLE(signum)*pref*gpar(:,l)/kpt_arr(l)*      &
                              AIMAG( dot_product(evcpm(1:npwx*npol,nb,2*eps_i(l) +sig-1),H_evc(1:npwx*npol,nb)))
              ENDDO
              !
            ENDDO
          ENDDO
        ENDDO
        !
        ! IC TERM
        !
        DO l = 1, 3 ! loop over gpar's
          DO sig = 0, 1 ! i +/-
            DO sigp = 0, 1 ! j +/-
              IF (sig==sigp) THEN
                signum = 1
              ELSE
                signum = -1
              ENDIF
              !
              H_evc = (0.0d0,0.0d0)
              store_flag = lelfield
              lelfield = .FALSE.
              CALL h_psi( npwx, npw_k, nbnd, evc_k, H_evc )
              lelfield = store_flag
              !
              DO nb = 1, nbnd ! loop over bands
                DO mb = 1, nbnd ! loop over bands
                  store1 = dot_product( evc_k(1:npw_k,nb), H_evc(1:npw_k,mb))
                  store2 = dot_product( evcpm(1:npw_k,mb, 2*eps_i(l)+sig-1), &
                                        evcpm(1:npw_k,nb, 2*eps_j(l)+sigp-1)  )
                  IF (noncolin) THEN
                     store1 = store1 + dot_product( evc_k(npwx+1:npwx+npw_k,nb),   &
                                                    H_evc(npwx+1:npwx+npw_k,mb)  )
                     store2 = store2 + dot_product( evcpm(npwx+1:npwx+npw_k,mb, 2*eps_i(l)+sig-1),&
                                                    evcpm(npwx+1:npwx+npw_k,nb, 2*eps_j(l)+sigp-1) )
                  ENDIF
                  CALL mp_sum( store1, world_comm )
                  CALL mp_sum( store2, world_comm )
                  mic = mic + DBLE(signum)*pref*gpar(:,l)/kpt_arr(l)*AIMAG(store1*store2)
                ENDDO
              ENDDO
              !
            ENDDO
          ENDDO
        ENDDO
        !
      ENDDO ! loop over k-points
    ENDDO
  ENDDO
  !
  CALL mp_sum( mlc, world_comm )
  !
  WRITE (stdout,*) ' '
  WRITE (stdout,*) '=============================================='
  WRITE (stdout,*) '=     ORBITAL MAGNETIZATION (KUBO TERMS)     ='
  WRITE (stdout,*) '=============================================='
  WRITE (stdout,*) ' '
  WRITE (stdout,*) '=     Local circulation term                 ='
  WRITE (stdout,*) 'M_LC = ', mlc(1), mlc(2), mlc(3),' (A/m)'
  WRITE (stdout,*) 'M_LC = ', mlc(1)*pbm, mlc(2)*pbm, mlc(3)*pbm,' (Bohr mag/cell)'
  WRITE (stdout,*) ' '
  WRITE (stdout,*) '=     Itinerant circulation term             ='
  WRITE (stdout,*) 'M_IC = ', mic(1), mic(2), mic(3),' (A/m)'
  WRITE (stdout,*) 'M_IC = ', mic(1)*pbm, mic(2)*pbm, mic(3)*pbm,' (Bohr mag/cell)'
  WRITE (stdout,*) ' '
  WRITE (stdout,*) '=============================================='
  WRITE (stdout,*) ' '
  !
  ! Deallocate arrays
  CALL deallocate_bec_type ( becp )
  DEALLOCATE( temp )
  DEALLOCATE( evc_k )
  DEALLOCATE( evc_kp )
  DEALLOCATE( aux_k )
  DEALLOCATE( aux_kp )
  DEALLOCATE( ln )
  DEALLOCATE( map_g )
  DEALLOCATE( evcpm )
  DEALLOCATE( H_evc )
  !
END SUBROUTINE orbm_kubo
