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237 lines
8.2 KiB
Org Mode
237 lines
8.2 KiB
Org Mode
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#+title: Configuration Sigma Vector Helpers
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#+author: Vijay Gopal Chilkuri
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#+email: vijay.gopal.c@gmail.com
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* Generate the singly excited configurations on-the-fly
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The algorithm is based on the work by Garniron et. al. (see thesis Chap 5).
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The basic idea is to generate \(|\alpha\rangle\)'s on-the-fly.
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The algorithm is based on the idea of splitting the list of \(|\alpha\rangle\)'s
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into blocks associated with a selected determinant \(|D_I\rangle\).
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** Create a function to return a list of alphas
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Here we create a list of \(|\alpha\rangle\)'s associated with
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the input determinant \(|D_I\rangle\).
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#+begin_src f90 :main no :tangle configuration_CI_sigma_helpers.irp.f
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subroutine obtain_associated_alphaI(idxI, Icfg, alphasIcfg, NalphaIcfg)
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implicit none
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use bitmasks
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BEGIN_DOC
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! Documentation for alphasI
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! Returns the associated alpha's for
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! the input configuration Icfg.
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END_DOC
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integer,intent(in) :: idxI ! The id of the Ith CFG
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integer(bit_kind),intent(in) :: Icfg(N_int,2)
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integer,intent(out) :: NalphaIcfg
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integer(bit_kind),intent(out) :: alphasIcfg(N_int,2,*)
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logical,dimension(:,:),allocatable :: tableUniqueAlphas
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integer :: listholes(mo_num)
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integer :: holetype(mo_num) ! 1-> SOMO 2->DOMO
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integer :: nholes
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integer :: nvmos
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integer :: listvmos(mo_num)
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integer :: vmotype(mo_num) ! 1 -> VMO 2 -> SOMO
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integer*8 :: Idomo
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integer*8 :: Isomo
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integer*8 :: Jdomo
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integer*8 :: Jsomo
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integer*8 :: diffSOMO
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integer*8 :: diffDOMO
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integer :: ndiffSOMO
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integer :: ndiffDOMO
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integer :: ndiffAll
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integer :: i
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integer :: j
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integer :: k
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integer :: hole
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integer :: p
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integer :: q
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integer :: countalphas
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logical :: pqAlreadyGenQ
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logical :: pqExistsQ
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Isomo = iand(reunion_of_act_virt_bitmask(1,1),Icfg(1,1))
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Idomo = iand(reunion_of_act_virt_bitmask(1,1),Icfg(1,2))
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!print*,"Input cfg"
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!call debug_spindet(Isomo,1)
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!call debug_spindet(Idomo,1)
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!print*,n_act_orb, "monum=",mo_num," n_core=",n_core_orb
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! find out all pq holes possible
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nholes = 0
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! holes in SOMO
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do i = n_core_orb+1,n_core_orb + n_act_orb
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if(POPCNT(IAND(Isomo,IBSET(0,i-1))) .EQ. 1) then
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nholes += 1
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listholes(nholes) = i
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holetype(nholes) = 1
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endif
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end do
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! holes in DOMO
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do i = n_core_orb+1,n_core_orb + n_act_orb
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if(POPCNT(IAND(Idomo,IBSET(0,i-1))) .EQ. 1) then
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nholes += 1
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listholes(nholes) = i
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holetype(nholes) = 2
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endif
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end do
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! find vmos
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listvmos = -1
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vmotype = -1
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nvmos = 0
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do i = n_core_orb+1,n_core_orb + n_act_orb
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!print *,i,IBSET(0,i-1),POPCNT(IAND(Isomo,(IBSET(0,i-1)))), POPCNT(IAND(Idomo,(IBSET(0,i-1))))
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if(POPCNT(IAND(Isomo,(IBSET(0,i-1)))) .EQ. 0 .AND. POPCNT(IAND(Idomo,(IBSET(0,i-1)))) .EQ. 0) then
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nvmos += 1
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listvmos(nvmos) = i
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vmotype(nvmos) = 1
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else if(POPCNT(IAND(Isomo,(IBSET(0,i-1)))) .EQ. 1 .AND. POPCNT(IAND(Idomo,(IBSET(0,i-1)))) .EQ. 0 ) then
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nvmos += 1
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listvmos(nvmos) = i
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vmotype(nvmos) = 2
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end if
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end do
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!print *,"Nvmo=",nvmos
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!print *,listvmos
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!print *,vmotype
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allocate(tableUniqueAlphas(mo_num,mo_num))
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tableUniqueAlphas = .FALSE.
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! Now find the allowed (p,q) excitations
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Isomo = iand(reunion_of_act_virt_bitmask(1,1),Icfg(1,1))
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Idomo = iand(reunion_of_act_virt_bitmask(1,1),Icfg(1,2))
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!print *,"Isomo"
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!call debug_spindet(Isomo,1)
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!call debug_spindet(Idomo,1)
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do i = 1,nholes
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p = listholes(i)
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do j = 1,nvmos
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q = listvmos(j)
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if(p == q) cycle
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if(holetype(i) .EQ. 1 .AND. vmotype(j) .EQ. 1) then
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! SOMO -> VMO
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Jsomo = IBCLR(Isomo,p-1)
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Jsomo = IBSET(Jsomo,q-1)
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Jdomo = Idomo
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else if(holetype(i) .EQ. 1 .AND. vmotype(j) .EQ. 2) then
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! SOMO -> SOMO
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Jsomo = IBCLR(Isomo,p-1)
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Jsomo = IBCLR(Jsomo,q-1)
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Jdomo = IBSET(Idomo,q-1)
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else if(holetype(i) .EQ. 2 .AND. vmotype(j) .EQ. 1) then
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! DOMO -> VMO
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Jsomo = IBSET(Isomo,p-1)
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Jsomo = IBSET(Jsomo,q-1)
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Jdomo = IBCLR(Idomo,p-1)
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else if(holetype(i) .EQ. 2 .AND. vmotype(j) .EQ. 2) then
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! DOMO -> SOMO
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Jsomo = IBSET(Isomo,p-1)
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Jsomo = IBCLR(Jsomo,q-1)
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Jdomo = IBCLR(Idomo,p-1)
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Jdomo = IBSET(Jdomo,q-1)
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else
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print*,"Something went wrong in obtain_associated_alphaI"
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endif
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pqAlreadyGenQ = .FALSE.
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! First check if it can be generated before
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do k = 1, idxI-1
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diffSOMO = XOR(Jsomo,iand(reunion_of_act_virt_bitmask(1,1),psi_configuration(1,1,k)))
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diffDOMO = XOR(Jdomo,iand(reunion_of_act_virt_bitmask(1,1),psi_configuration(1,2,k)))
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ndiffSOMO = POPCNT(diffSOMO)
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ndiffDOMO = POPCNT(diffDOMO)
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if(POPCNT(XOR(diffSOMO,diffDOMO)) .LE. 1 .AND. ndiffDOMO .LT. 3) then
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pqAlreadyGenQ = .TRUE.
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!print *,i,k,ndiffSOMO,ndiffDOMO
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!call debug_spindet(Jsomo,1)
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!call debug_spindet(Jdomo,1)
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!call debug_spindet(iand(reunion_of_act_virt_bitmask(1,1),psi_configuration(1,1,k)),1)
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!call debug_spindet(iand(reunion_of_act_virt_bitmask(1,1),psi_configuration(1,2,k)),1)
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EXIT
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endif
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end do
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if(pqAlreadyGenQ) cycle
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pqExistsQ = .FALSE.
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! now check if this exists in the selected list
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do k = idxI, N_configuration
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diffSOMO = XOR(OR(reunion_of_act_virt_bitmask(1,1),Jsomo),psi_configuration(1,1,k))
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diffDOMO = XOR(OR(reunion_of_act_virt_bitmask(1,1),Jdomo),psi_configuration(1,2,k))
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ndiffSOMO = POPCNT(diffSOMO)
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ndiffDOMO = POPCNT(diffDOMO)
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if((ndiffSOMO + ndiffDOMO) .EQ. 0) then
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pqExistsQ = .TRUE.
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EXIT
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endif
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end do
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if(.NOT. pqExistsQ) then
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tableUniqueAlphas(p,q) = .TRUE.
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!print *,p,q
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!call debug_spindet(Jsomo,1)
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!call debug_spindet(Jdomo,1)
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endif
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end do
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end do
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!print *,tableUniqueAlphas(:,:)
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! prune list of alphas
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Isomo = Icfg(1,1)
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Idomo = Icfg(1,2)
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Jsomo = Icfg(1,1)
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Jdomo = Icfg(1,2)
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NalphaIcfg = 0
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do i = 1, nholes
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p = listholes(i)
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do j = 1, nvmos
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q = listvmos(j)
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if(tableUniqueAlphas(p,q)) then
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if(holetype(i) .EQ. 1 .AND. vmotype(j) .EQ. 1) then
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! SOMO -> VMO
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Jsomo = IBCLR(Isomo,p-1)
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Jsomo = IBSET(Jsomo,q-1)
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Jdomo = Idomo
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else if(holetype(i) .EQ. 1 .AND. vmotype(j) .EQ. 2) then
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! SOMO -> SOMO
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Jsomo = IBCLR(Isomo,p-1)
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Jsomo = IBCLR(Jsomo,q-1)
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Jdomo = IBSET(Idomo,q-1)
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else if(holetype(i) .EQ. 2 .AND. vmotype(j) .EQ. 1) then
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! DOMO -> VMO
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Jsomo = IBSET(Isomo,p-1)
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Jsomo = IBSET(Jsomo,q-1)
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Jdomo = IBCLR(Idomo,p-1)
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else if(holetype(i) .EQ. 2 .AND. vmotype(j) .EQ. 2) then
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! DOMO -> SOMO
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Jsomo = IBSET(Isomo,p-1)
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Jsomo = IBCLR(Jsomo,q-1)
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Jdomo = IBCLR(Idomo,p-1)
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Jdomo = IBSET(Jdomo,q-1)
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else
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print*,"Something went wrong in obtain_associated_alphaI"
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endif
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NalphaIcfg += 1
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!print *,p,q,"|",holetype(i),vmotype(j)
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!call debug_spindet(Jsomo,1)
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!call debug_spindet(Jdomo,1)
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alphasIcfg(1,1,NalphaIcfg) = Jsomo
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alphasIcfg(1,2,NalphaIcfg) = Jdomo
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endif
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end do
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end do
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end subroutine
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#+end_src
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