The effect of self-interaction error on electrostatic dipoles calculated using density functional theory
- Central Michigan Univ., Mount Pleasant, MI (United States)
- Univ. of Texas at El Paso, TX (United States)
Spurious electron self-interaction in density functional approximations (DFAs) can lead to inaccurate predictions of charge transfer in heteronuclear molecules that manifest as errors in calculated electrostatic dipoles. Here we show the magnitude of these errors on dipoles computed for a diverse set of 47 molecules taken from the recent benchmark study of Hait and Head-Gordon. We compare results of Perdew-Wang local spin density approximation (PW92), Perdew-Burke-Ernzerhof (PBE) generalized gradient approximation (GGA), and strongly constrained and appropriatedly normed (SCAN) meta-GGA dipole calculations, along with those of their respective self-interaction-corrected (SIC) counterparts, to reference values from accurate wave function-based methods. The SIC calculations were carried out using the Fermi-Löwdin orbital (FLO-SIC) approach. We find that correcting for self-interaction generally increases the degree of charge transfer, thereby increasing the size of calculated dipole moments. The FLO-SIC-PW92 and FLO-SIC-PBE dipoles are in better agreement with reference values than their uncorrected DFA counterparts, particularly for strongly ionic molecules where significant improvement is seen. Applying FLO-SIC to SCAN does not improve dipole values overall. In addition, we show that removing self-interaction improves the description of the dipole for stretched-bond geometries and recovers the physically correct separated atom limit of zero dipole. Finally, we find that the best agreement between the FLO-SIC-DFA and reference dipoles occurs when the molecular geometries are optimized using the FLO-SIC-DFA.
- Research Organization:
- Univ. of Texas at El Paso, TX (United States); Central Michigan Univ., Mount Pleasant, MI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0018331
- OSTI ID:
- 1596360
- Alternate ID(s):
- OSTI ID: 1573086
- Journal Information:
- Journal of Chemical Physics, Vol. 151, Issue 17; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Importance of self-interaction-error removal in density functional calculations on water cluster anions
|
journal | January 2020 |
A step in the direction of resolving the paradox of Perdew-Zunger self-interaction correction
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journal | December 2019 |
Importance of self-interaction-error removal in density functional calculations on water cluster anions | text | January 2020 |
A step in the direction of resolving the paradox of Perdew–Zunger self-interaction correction. II. Gauge consistency of the energy density at three levels of approximation
|
journal | June 2020 |
Self-Interaction Correction in Water-Ion Clusters | text | January 2020 |
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