Assessment of the Tao-Mo nonempirical semilocal density functional in applications to solids and surfaces
Journal Article
·
· Physical Review B
- Temple Univ., Philadelphia, PA (United States); Univ. of Pennsylvania, Philadelphia, PA (United States); DOE/OSTI
- Princeton Univ., NJ (United States)
- Univ. of Western Ontario, London, ON (Canada)
- Rice Univ., Houston, TX (United States)
- Temple Univ., Philadelphia, PA (United States); Univ. of Pennsylvania, Philadelphia, PA (United States)
Recently, Tao and Mo developed a semilocal exchange-correlation density functional. The exchange part of this functional is derived from a density-matrix expansion corrected to reproduce the fourth-order gradient expansion of the exchange energy in the slowly-varying-density limit, while the correlation part is based on the Tao-Perdew-Staroverov-Scuseria (TPSS) correlation functional, with a modification for the low-density limit. In this work, the Tao-Mo (TM) functional is assessed by computing various properties of solids and jellium surfaces. This includes 22 lattice constants and bulk moduli, 30 band gaps, seven cohesive energies, and jellium surface exchange and correlation energies for the density parameter rs in the range from 2 to 3 bohr. Our calculations show that the TM approximation can yield consistently high accuracy for most properties considered here, with mean absolute errors (MAEs) of 0.025 Å for lattice constants, 7.0 GPa for bulk moduli, 0.08 eV/atom for cohesive energies, and 35 erg / cm2 for surface exchange-correlation energies. The MAE in band gaps is larger than that of TPSS, but slightly smaller than the errors of the local spin-density approximation, Perdew-Burke-Ernzerhof generalized gradient approximation, and revised TPSS. However, band gaps are still underestimated, particularly for large-gap semiconductors, compared to the Heyd-Scuseria-Ernzerhof nonlocal screened hybrid functional.
- Research Organization:
- Rice Univ., Houston, TX (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0001474
- OSTI ID:
- 1535827
- Alternate ID(s):
- OSTI ID: 1339183
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 3 Vol. 95; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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