Hubbard-corrected density functional perturbation theory with ultrasoft pseudopotentials

Floris, Andrea, Timrov, I., Himmetoglu, B. , Marzari, N., de Gironcoli, S. and Cococcioni, M. (2020) Hubbard-corrected density functional perturbation theory with ultrasoft pseudopotentials. Physical Review B, 101 (6). ISSN 2469-9950

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Hubbard-corrected density functional perturbation theory with ultrasoft pseudopotentials
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We present in full detail a newly developed formalism enabling density functional perturbation theory (DFPT) calculations from a DFT+U ground state. The implementation includes ultrasoft pseudopotentials and is valid for both insulating and metallic systems. It aims at fully exploiting the versatility of DFPT combined with the low-cost
DFT+U functional. This allows us to avoid computationally intensive frozen-phonon calculations when
DFT+U is used to eliminate the residual electronic self-interaction from approximate functionals and to capture the localization of valence electrons, e.g., on d or f states. In this way, the effects of electronic localization (possibly due to correlations) are consistently taken into account in the calculation of specific phonon modes, Born effective charges, dielectric tensors, and in quantities requiring well converged sums over many phonon frequencies, as phonon density of states and free energies. The new computational tool is applied to two representative systems, namely CoO, a prototypical transition metal monoxide and LiCoO2, a material employed for the cathode of Li-ion batteries. The results show the effectiveness of our formalism to capture in a quantitatively reliable way the vibrational properties of systems with localized valence electrons.

Keywords:DFT+U, phonons, vibrational properties, strongly correlated systems, DFPT+U, density functional perturbation theory, Hubbard correction, ultrasoft pseudopotentials
Subjects:F Physical Sciences > F200 Materials Science
F Physical Sciences > F300 Physics
F Physical Sciences > F343 Computational Physics
F Physical Sciences > F321 Solid state Physics
Divisions:College of Science > School of Chemistry
ID Code:40139
Deposited On:05 Mar 2020 13:04

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