SCAN-based hybrid and double-hybrid density functionals from models without fitted parameters
Abstract
By incorporating the nonempirical SCAN semilocal density functional [Sun, Ruzsinszky, and Perdew, Phys. Rev. Lett. 115, 036402 (2015)] in the underlying expression of four existing hybrid and double-hybrid models, we propose one hybrid (SCAN0) and three double-hybrid (SCAN0-DH, SCAN-QIDH, and SCAN0-2) density functionals, which are free from any fitted parameters. The SCAN-based double-hybrid functionals consistently outperform their parent SCAN semilocal functional for self-interaction problems and noncovalent interactions. In particular, SCAN0-2, which includes about 79% of Hartree-Fock exchange and 50% of second-order Moller-Plesset correlation, is shown to be reliably accurate for a very diverse range of applications, such as thermochemistry, kinetics, noncovalent interactions, and self-interaction problems.
Keywords
Cite
@article{arxiv.1510.00381,
title = {SCAN-based hybrid and double-hybrid density functionals from models without fitted parameters},
author = {Kerwin Hui and Jeng-Da Chai},
journal= {arXiv preprint arXiv:1510.00381},
year = {2016}
}
Comments
23 pages, 6 figures, 1 table, supplementary material not included