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Title: A simple generalized gradient approximation for the noninteracting kinetic energy density functional

Journal Article · · Physical Review B
 [1];  [2];  [3]
  1. Univ. of Florida, Gainesville, FL (United States). Quantum Theory Project, Dept. of Physics; Laboratory for Laser Energetics, University of Rochester
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  3. Univ. of Florida, Gainesville, FL (United States). Quantum Theory Project, Dept. of Physics and Dept. of Chemistry

A simple, novel, non-empirical, constraint-based orbital-free generalized gradient approximation (GGA) non-interacting kinetic energy density functional is presented along with illustrative applications. The innovation is adaptation of constraint-based construction to the essential properties of pseudo-densities from the pseudo-potentials that are essential in plane-wave-basis ab initio molecular dynamics. This contrasts with constraining to the qualitatively different Kato-cusp-condition densities. The single parameter in the new functional is calibrated by satisfying Pauli potential positivity constraints for pseudo-atom densities. Finally, in static lattice tests on simple metals and semiconductors, the new LKT functional outperforms the previous best constraint-based GGA functional, VT84F (Phys. Rev. B 88, 161108(R) (2013)), is generally superior to a recently proposed meta-GGA, is reasonably competitive with parametrized two-point functionals, and is substantially faster.

Research Organization:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001944; SC0002139
OSTI ID:
1465779
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 4 Vol. 98; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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