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mirror of https://github.com/pfloos/quack synced 2024-11-04 13:13:51 +01:00

UBSE dynamic OK for spin-conserving transitions

This commit is contained in:
Pierre-Francois Loos 2020-09-30 00:13:47 +02:00
parent 30cc8afea8
commit 11f0ded287
4 changed files with 298 additions and 0 deletions

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subroutine unrestricted_Bethe_Salpeter_ZA_matrix_dynamic(ispin,eta,nBas,nC,nO,nV,nR,nSa,nSb,nSt,nS_sc,lambda,eGW, &
ERI_aaaa,ERI_aabb,ERI_bbbb,ERI_abab,OmRPA,rho_RPA,OmBSE,ZA_dyn)
! Compute the extra term for dynamical Bethe-Salpeter equation for linear response in the unrestricted formalism
implicit none
include 'parameters.h'
! Input variables
integer,intent(in) :: ispin
integer,intent(in) :: nBas
integer,intent(in) :: nC(nspin)
integer,intent(in) :: nO(nspin)
integer,intent(in) :: nV(nspin)
integer,intent(in) :: nR(nspin)
integer,intent(in) :: nSa
integer,intent(in) :: nSb
integer,intent(in) :: nSt
integer,intent(in) :: nS_sc
double precision,intent(in) :: eta
double precision,intent(in) :: lambda
double precision,intent(in) :: eGW(nBas,nspin)
double precision,intent(in) :: ERI_aaaa(nBas,nBas,nBas,nBas)
double precision,intent(in) :: ERI_aabb(nBas,nBas,nBas,nBas)
double precision,intent(in) :: ERI_bbbb(nBas,nBas,nBas,nBas)
double precision,intent(in) :: ERI_abab(nBas,nBas,nBas,nBas)
double precision,intent(in) :: OmRPA(nS_sc)
double precision,intent(in) :: rho_RPA(nBas,nBas,nS_sc,nspin)
double precision,intent(in) :: OmBSE
! Local variables
double precision :: chi
double precision :: eps
integer :: i,j,a,b,ia,jb,kc
! Output variables
double precision,intent(out) :: ZA_dyn(nSt,nSt)
!--------------------------------------------------!
! Build BSE matrix for spin-conserving transitions !
!--------------------------------------------------!
ZA_dyn(:,:) = 0d0
if(ispin == 1) then
! aaaa block
ia = 0
do i=nC(1)+1,nO(1)
do a=nO(1)+1,nBas-nR(1)
ia = ia + 1
jb = 0
do j=nC(1)+1,nO(1)
do b=nO(1)+1,nBas-nR(1)
jb = jb + 1
chi = 0d0
do kc=1,nS_sc
eps = + OmBSE - OmRPA(kc) - (eGW(a,1) - eGW(j,1))
chi = chi + rho_RPA(i,j,kc,1)*rho_RPA(a,b,kc,1)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
eps = + OmBSE - OmRPA(kc) - (eGW(b,1) - eGW(i,1))
chi = chi + rho_RPA(i,j,kc,1)*rho_RPA(a,b,kc,1)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
enddo
ZA_dyn(ia,jb) = ZA_dyn(ia,jb) + lambda*chi
enddo
enddo
enddo
enddo
! bbbb block
ia = 0
do i=nC(2)+1,nO(2)
do a=nO(2)+1,nBas-nR(2)
ia = ia + 1
jb = 0
do j=nC(2)+1,nO(2)
do b=nO(2)+1,nBas-nR(2)
jb = jb + 1
chi = 0d0
do kc=1,nS_sc
eps = + OmBSE - OmRPA(kc) - (eGW(a,2) - eGW(j,2))
chi = chi + rho_RPA(i,j,kc,2)*rho_RPA(a,b,kc,2)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
eps = + OmBSE - OmRPA(kc) - (eGW(b,2) - eGW(i,2))
chi = chi + rho_RPA(i,j,kc,2)*rho_RPA(a,b,kc,2)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
enddo
ZA_dyn(nSa+ia,nSa+jb) = ZA_dyn(nSa+ia,nSa+jb) + lambda*chi
enddo
enddo
enddo
enddo
end if
!--------------------------------------------!
! Build BSE matrix for spin-flip transitions !
!--------------------------------------------!
if(ispin == 2) then
! abab block
ia = 0
do i=nC(1)+1,nO(1)
do a=nO(2)+1,nBas-nR(2)
ia = ia + 1
jb = 0
do j=nC(1)+1,nO(1)
do b=nO(2)+1,nBas-nR(2)
jb = jb + 1
chi = 0d0
do kc=1,nS_sc
eps = + OmBSE - OmRPA(kc) - (eGW(a,1) - eGW(j,2))
chi = chi + rho_RPA(i,j,kc,1)*rho_RPA(a,b,kc,2)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
eps = + OmBSE - OmRPA(kc) - (eGW(b,1) - eGW(i,2))
chi = chi + rho_RPA(i,j,kc,1)*rho_RPA(a,b,kc,2)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
enddo
ZA_dyn(ia,jb) = ZA_dyn(ia,jb) + lambda*chi
end do
end do
end do
end do
! baba block
ia = 0
do i=nC(2)+1,nO(2)
do a=nO(1)+1,nBas-nR(1)
ia = ia + 1
jb = 0
do j=nC(2)+1,nO(2)
do b=nO(1)+1,nBas-nR(1)
jb = jb + 1
chi = 0d0
do kc=1,nS_sc
eps = + OmBSE - OmRPA(kc) - (eGW(a,2) - eGW(j,1))
chi = chi + rho_RPA(i,j,kc,2)*rho_RPA(a,b,kc,1)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
eps = + OmBSE - OmRPA(kc) - (eGW(b,2) - eGW(i,1))
chi = chi + rho_RPA(i,j,kc,2)*rho_RPA(a,b,kc,1)*(eps**2 - eta**2)/(eps**2 + eta**2)**2
enddo
ZA_dyn(nSa+ia,nSa+jb) = ZA_dyn(nSa+ia,nSa+jb) + lambda*chi
end do
end do
end do
end do
end if
end subroutine unrestricted_Bethe_Salpeter_ZA_matrix_dynamic

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subroutine unrestricted_Bethe_Salpeter_dynamic_perturbation(ispin,dTDA,eta,nBas,nC,nO,nV,nR,nS,nSa,nSb,nSt,nS_sc,eGW, &
ERI_aaaa,ERI_aabb,ERI_bbbb,ERI_abab,dipole_int_aa,dipole_int_bb, &
OmRPA,rho_RPA,OmBSE,XpY_BSE,XmY_BSE)
! Compute dynamical effects via perturbation theory for BSE
implicit none
include 'parameters.h'
! Input variables
integer,intent(in) :: ispin
logical,intent(in) :: dTDA
double precision,intent(in) :: eta
integer,intent(in) :: nBas
integer,intent(in) :: nC(nspin)
integer,intent(in) :: nO(nspin)
integer,intent(in) :: nV(nspin)
integer,intent(in) :: nR(nspin)
integer,intent(in) :: nS(nspin)
integer,intent(in) :: nSa
integer,intent(in) :: nSb
integer,intent(in) :: nSt
integer,intent(in) :: nS_sc
double precision,intent(in) :: eGW(nBas,nspin)
double precision,intent(in) :: ERI_aaaa(nBas,nBas,nBas,nBas)
double precision,intent(in) :: ERI_aabb(nBas,nBas,nBas,nBas)
double precision,intent(in) :: ERI_bbbb(nBas,nBas,nBas,nBas)
double precision,intent(in) :: ERI_abab(nBas,nBas,nBas,nBas)
double precision,intent(in) :: dipole_int_aa(nBas,nBas,ncart)
double precision,intent(in) :: dipole_int_bb(nBas,nBas,ncart)
double precision,intent(in) :: OmRPA(nS_sc)
double precision,intent(in) :: rho_RPA(nBas,nBas,nS_sc,nspin)
double precision,intent(in) :: OmBSE(nSt)
double precision,intent(in) :: XpY_BSE(nSt,nSt)
double precision,intent(in) :: XmY_BSE(nSt,nSt)
! Local variables
integer :: ia
integer,parameter :: maxS = 10
double precision :: gapGW
double precision,allocatable :: OmDyn(:)
double precision,allocatable :: ZDyn(:)
double precision,allocatable :: X(:)
double precision,allocatable :: Y(:)
double precision,allocatable :: A_dyn(:,:)
double precision,allocatable :: ZA_dyn(:,:)
! Memory allocation
allocate(OmDyn(nSt),ZDyn(nSt),X(nSt),Y(nSt),A_dyn(nSt,nSt),ZA_dyn(nSt,nSt))
! Print main components of transition vectors
if(dTDA) then
write(*,*)
write(*,*) '*** dynamical TDA activated ***'
write(*,*)
end if
gapGW = min(eGW(nO(1)+1,1),eGW(nO(2)+1,2)) - max(eGW(nO(1),1),eGW(nO(2),2))
write(*,*) '---------------------------------------------------------------------------------------------------'
write(*,*) ' First-order dynamical correction to static Bethe-Salpeter excitation energies '
write(*,*) '---------------------------------------------------------------------------------------------------'
write(*,'(A57,F10.6,A3)') ' BSE neutral excitation must be lower than the GW gap = ',gapGW*HaToeV,' eV'
write(*,*) '---------------------------------------------------------------------------------------------------'
write(*,'(2X,A5,1X,A20,1X,A20,1X,A20,1X,A20)') '#','Static (eV)','Dynamic (eV)','Correction (eV)','Renorm. (eV)'
write(*,*) '---------------------------------------------------------------------------------------------------'
do ia=1,min(nSt,maxS)
X(:) = 0.5d0*(XpY_BSE(ia,:) + XmY_BSE(ia,:))
Y(:) = 0.5d0*(XpY_BSE(ia,:) - XmY_BSE(ia,:))
! First-order correction
if(dTDA) then
! Resonant part of the BSE correction for dynamical TDA
call unrestricted_Bethe_Salpeter_A_matrix_dynamic(ispin,eta,nBas,nC,nO,nV,nR,nSa,nSb,nSt,nS_sc,1d0,eGW, &
ERI_aaaa,ERI_aabb,ERI_bbbb,ERI_abab,OmRPA,rho_RPA,OmBSE(ia),A_dyn)
! Renormalization factor of the resonant parts for dynamical TDA
call unrestricted_Bethe_Salpeter_ZA_matrix_dynamic(ispin,eta,nBas,nC,nO,nV,nR,nSa,nSb,nSt,nS_sc,1d0,eGW, &
ERI_aaaa,ERI_aabb,ERI_bbbb,ERI_abab,OmRPA,rho_RPA,OmBSE(ia),ZA_dyn)
ZDyn(ia) = dot_product(X,matmul(ZA_dyn,X))
OmDyn(ia) = dot_product(X,matmul( A_dyn,X))
end if
ZDyn(ia) = 1d0/(1d0 - ZDyn(ia))
OmDyn(ia) = ZDyn(ia)*OmDyn(ia)
write(*,'(2X,I5,5X,F15.6,5X,F15.6,5X,F15.6,5X,F15.6)') &
ia,OmBSE(ia)*HaToeV,(OmBSE(ia)+OmDyn(ia))*HaToeV,OmDyn(ia)*HaToeV,ZDyn(ia)
end do
write(*,*) '---------------------------------------------------------------------------------------------------'
write(*,*)
end subroutine unrestricted_Bethe_Salpeter_dynamic_perturbation

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IDIR =../../include
MODDIR=../modules
FC = gfortran -I$(IDIR) -J$(MODDIR) -I$(MODDIR)
#FC = ifort -I$(IDIR) -module $(MODDIR)
AR = libtool
ifeq ($(DEBUG),1)
FFLAGS = -Wall -g -msse4.2 -fcheck=all -Waliasing -Wampersand -Wconversion -Wsurprising -Wintrinsics-std -Wno-tabs -Wintrinsic-shadow -Wline-truncation -Wreal-q-constant
else
FFLAGS = -Wall -Wno-unused -Wno-unused-dummy-argument -O3
endif

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src/modules/.gitignore vendored Normal file
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