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Semilocal exchange hole with an application to range-separated density functionals

Journal Article · · Physical Review. B
 [1];  [2];  [2]
  1. Temple Univ., Philadelphia, PA (United States). Dept. of Physics; DOE/OSTI
  2. Rice Univ., Houston, TX (United States). Dept. of Chemistry. Dept. of Physics and Astronomy
The exchange-correlation hole is a central concept in density functional theory. It not only provides justification for an exchange-correlation energy functional but also serves as a local ingredient for nonlocal range-separated density functionals. However, due to the nonlocal nature, modeling the conventional exact exchange hole presents a great challenge to density functional theory. In this work, we propose a semilocal exchange hole underlying the Tao-Perdew-Staroverov-Scuseria (TPSS) meta-generalized gradient approximation functional. Our model is distinct from previous ones not only at small separation between an electron and the hole around the electron but also in the way it interpolates between rapidly varying and slowly varying densities. Here the interpolation is determined by the wave-vector analysis on the infinite-barrier model for a jellium surface. Numerical tests show that our exchange-hole model mimics the conventional exact one quite well for atoms. As a simple application, we apply the hole model to construct a TPSS-based range-separated functional. We find that this range-separated functional can substantially improve the band gaps and barrier heights of TPSS, without losing much accuracy for atomization energies.
Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001474
OSTI ID:
1535883
Alternate ID(s):
OSTI ID: 1346765
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 12 Vol. 95; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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A meta-GGA level screened range-separated hybrid functional by employing short range Hartree–Fock with a long range semilocal functional journal January 2018
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Laplacian free and asymptotic corrected semilocal exchange potential applied to the band gap of solids journal January 2019
Efficient lattice constants and energy bandgaps for condensed systems from a meta-GGA level screened range-separated hybrid functional journal September 2018
Exploring local range separation: The role of spin scaling and one-electron self-interaction journal October 2019
Screened range-separated hybrid by balancing the compact and slowly varying density regimes: Satisfaction of local density linear response journal January 2020
Comparison of dispersion-corrected exchange-correlation functionals using atomic orbitals journal December 2019