Orbital Density Dependent Functionals
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1 Orbital Density Dependent Functionals S. Kluepfel1, P. Kluepfel1, Hildur Guðmundsdóttir1 and Hannes Jónsson1,2 1. Univ. of Iceland; 2. Aalto University Outline: Problems with GGA approximation (PBE, RPBE,...) Orbital density dependent (ODD) functionals: in particular Perdew-Zunger self-interaction correction; CPU time can scale as for DFT/GGA; Codes: Quantice (Gaussian orbitals), GPAW Application to atoms, molecules and solids
2 Electronic Structure Calculations Wave function based Methods DFT and beyond... GW MPn perturbation Multi-Configuration HF Hartree-Fock (HF) Exact solution obtained in principle, but effort scales ~ N7. Good for small systems (N<30) Hybrid?? (PBE0,HSE...) Meta GGA GGA LDA Improved accuracy needed, keeping scaling of effort low (~ N3 for GGA which can be applied to large systems even N~1000)
3 Hartree-Fock approximation Each electron is subject to the average interaction with the other electrons a mean field approximation orbital orbital energy
4 Hartree-Fock calculations of atoms Compare energy per electron with high level estimate of total energy,eref, by Chakravorty & Davidson, JPC 100, 6167 (1996). HF gives poor estimate of the total energy But, HOMO energy agrees quite well with experimental ionization energy (Koopman). Orbital energies correspond remarkably well will photo electron spectra ( orbitals are real???).
5 KS-DFT (cont.) LDA worse than HF, but GGA (the PBE functional) which includes gradients is more accurate than HF. Hybrid functional (PBE0) is only marginally better. But, KS-DFT orbital energies are not good estimates of ionization energy PBE0 hybrid functional again only marginally better than PBE
6 DFT/GGA and LDA calculations have several shortcomings fractional charges in dissociated molecules transition energy / reaction paths: orbital energy / band structure: underestimated ionization potentials and band-gaps Energy (ev) electron distribution: activation energy underestimated orbital shape / chemical bonds molecular geometry / crystal structure Localized electronic defects destabilized (e.g., self-trapped holes) orbitals are not well-defined (post-process into natural / Wannier ) delocalized molecular orbitals vs. localized and chemically intuitive
7 + Na0.4 +Cl0.4-
8
9 Examples of problems with GGA: Too delocalized spin density Properly localized spin density Lægsgaard & Stokbro, PRL (2001)
10 Kohn-Sham density functional theory (KS-DFT)
11 EH EH
12 for a single electron
13 Back to H2+
14
15 But, how good is PZ-SIC? Calculate the Energy of atoms when real expansion coefficients are used in the orbitals: SIC-PBE improves total energy for Z < 7 SIC-PBE but, for Z 7 the total energy estimate becomes worse!!! consistent with results reported by Vydrov and Scuseria, JCP 121 (2004).
16 Test SIC in atoms, (cont.) Rather, use complex expansion coefficients SIC-PBE improves total energies for all studied atoms S IC-PBE error reduced to about 0.15 ev / electron Minimization of ODD functionals requires complex orbitals (see S. Klüpfel, P. Klüpfel and HJ, Phys.Rev.A (RC) 84, (2011))
17 Ionization potentials of atoms Obtained from the highest occupied orbital (HOMO) PBE has ~40% errors PBE0 (hybrid) gives some, but small improvement, error remains ~30% SIC-PBE has errors of ~5%, can give good estimates of orbital energies, also for deeper ionization (HOMO-1, HOMO-2, )
18 Bond energy of diatomics
19 Kluepfel, Kluepfel and Jónsson, JCP 137, (2012)
20
21 Kluepfel, Kluepfel and Jónsson, JCP 137, (2012)
22 Kluepfel, Kluepfel and Jónsson, JCP 137, (2012)
23 Molecular geometry can become wrong when SIC is applied with real orbitals, resolved when complex orbitals are used Kluepfel, Kluepfel and Jónsson, JCP 137, (2012)
24 Apply to defects in oxides: Electron hole in quartz with Al The DFT-SIC/2 correctly gives localized spin density and only one of the Al-O bonds is lengthened (by 0.3 A). Compare with EPR measurements, hyperfine constants: Al: Si: PBE-SIC/2 Exp PBE-SIC/2 Exp
25 Application to excited states of large molecules With SIC, the right 1/r dependence of the long range potential is built in, get the right Rydberg series of unoccupied states. Use solid-state approach to excited states of molecules, DFT-SIC energy functional, OEP for virtual. 3pxy orbital of trimethylamine Collaboration with Peter Weber at Brown University. Test: NH3 Orb. Exp. Calc. 3s 3pxy pz
26 Minimization of ODD Energy Functionals minimization under constrained orthonormalization of the orbitals: condition for minimal energy KS-DFT: Unitary invariance: Constraint matrix always Hermitian: Choose canonical orbitals, diagonalize λ: Effective Schrödinger equation, eigenvalue problem: & HF:
27 Minimization of PZ-SIC energy functional Energy/potential is not unitary invariant Localized orbitals give larger SIC than delocalized orbitals The equations for the orbitals are coupled cannot choose orbitals to diagonalize Hamiltonian depends on orbital index This is in contrast to Kohn-Sham and HF where the set of equations can be reduced to several one-electron eigen value problems. Umrigar ) The lack of unitary invariance represents a problem in the minimization. But, a set of unique orbitals is obtained, possibly more meaningful than MOs.
28
29 Minimization of ODD functionals Evaluate densities/potentials Optimize unitary transformation Evaluate Lagrange Multipliers Orthonormalization Evaluate Residual Vector Correction of the orbitals (Line Search, RMM-DIIS, ) Preconditioning of the search direction (Conjugate Gradients, Davidson Methods, )
30 Orbital Density Dependent (ODD) Functionals Pros: scaling of CPU time same as GGA localized electronic states not penalized improved total/single-particle energy can give meaningful orbitals directly Cons: inefficient minimization (not eigen value problem) several local minima Progress: Improved minimization procedure: P. Klüpfel, S. Klüpfel, K. Tsemekhman and HJ, Lecture Notes In Computer Science (2012)). Stage set for the development of an optimal ODD functional!
31 Summary - PBE-SIC (or, better, PW91-SIC) is an alternative to hybrid functionals such as PBE0 giving better estimate of total energy of atoms and ionization potentials. - Complex wave functions have to be used in self-consistent minimization of ODD functionals. - Orbital-Density-Dependent functionals can give meaningful, well-defined, localized orbitals and this extended functional form opens the possibility for higher accuracy (defect states, band gaps, bond energy ) at computational cost that scales with N as DFT/GGA. - Further development of ODD: Construct new exchange correlation functional consistent with self-interaction free Hartree energy (need new PAW projectors). Need to ensure size consistency, especially for solid state applications. Improve the minimization algorithm (get stuck in local minima, large systems don't converge...)
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