Pulay forces in density-functional theory with extended Hubbard functionals: From nonorthogonalized to orthogonalized manifolds

We present a derivation of the exact expression for Pulay forces in density-functional theory calculations augmented with extended Hubbard functionals and arising from the use of orthogonalized atomic orbitals as projectors for the Hubbard manifold. The derivative of the inverse square root of the o...

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Bibliographic Details
Published in:Physical review. B 2020-12, Vol.102 (23), p.1, Article 235159
Main Authors: Timrov, Iurii, Aquilante, Francesco, Binci, Luca, Cococcioni, Matteo, Marzari, Nicola
Format: Article
Language:English
Subjects:
Density functional theory
Manifolds
Mathematical analysis
Projectors
Pseudopotentials
Rare earth compounds
Transition metals
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Summary:We present a derivation of the exact expression for Pulay forces in density-functional theory calculations augmented with extended Hubbard functionals and arising from the use of orthogonalized atomic orbitals as projectors for the Hubbard manifold. The derivative of the inverse square root of the orbital overlap matrix is obtained as a closed-form solution of the associated Lyapunov (Sylvester) equation. The expression for the resulting contribution to the forces is presented in the framework of ultrasoft pseudopotentials and the projector-augmented-wave method and using a plane-wave basis set. We have benchmarked the present implementation with respect to finite differences of total energies for the case of NiO, finding excellent agreement. Owing to the accuracy of Hubbard-corrected density-functional theory calculations-provided the Hubbard parameters are computed for the manifold under consideration-the present work paves the way for systematic studies of solid-state and molecular transition-metal and rare-earth compounds.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.235159