A first-principles downfolding framework that includes short- and long-range electron-phonon coupling predicts large phonon screening of electron interactions, including an attractive nearest-neighbor interaction in GeTe.
Optimized norm-conserving Vanderbilt pseudopotentials
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abstract
Fully-nonlocal two-projector norm-conserving pseudopotentials are shown to be compatible with a systematic approach to the optimization of convergence with the size of the plane-wave basis. A new formulation of the optimization is developed, including the ability to apply it to positive-energy atomic scattering states, and to enforce greater continuity in the pseudopotential. The generalization of norm-conservation to multiple projectors is reviewed and recast for the present purposes. Comparisons among the results of all-electron and one- and two-projector norm-conserving pseudopotential calculations of lattice constants and bulk moduli are made for a group of solids chosen to represent a variety of types of bonding and a sampling of the periodic table.
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Theory of ab initio downfolding with arbitrary range electron-phonon coupling
A first-principles downfolding framework that includes short- and long-range electron-phonon coupling predicts large phonon screening of electron interactions, including an attractive nearest-neighbor interaction in GeTe.