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Cubic spline solver for generalized density functional treatments of atoms
and generation of atomic
datasets for use with exchange-correlation functionals including meta-GGA
N. A. W. Holzwarth, Marc Torrent, Jean-Baptiste Charraud,
and Michel Côté
Physical Review B 105 , 125144 (2022)
Local copy: PDF
Supplemental materials: SuppPDF
Within generalized density functional theory, recent developments of functionals which depend upon the
kinetic energy density, such as the r2SCAN form, show significant improvement in the computational representation
of real material properties. In order to implement these forms within plane-wave codes, it is necessary to use
pseudopotentials, ideally constructed with the same exchange-correlation functional as has been implemented
for the projector augmented-wave (PAW) formalism in the ATOMPAW code. This was accomplished with the help
of an efficient solver for the self-consistent radial bound states of each atom, based on cubic spline interpolation.
Details of the formalism are presented, and preliminary results for several simple materials are encouraging.