Accurate double excitations from ensemble density functional calculations
Abstract
The recent use of a new ensemble in density functional theory (DFT) to produce direct corrections to the Kohn-Sham transitions yields the elusive double excitations that are missed by time-dependent DFT (TDDFT) with the standard adiabatic approximation. But accuracies are lower than for single excitations, and formal arguments about TDDFT suggest that a correction kernel is needed. In principle, ensemble DFT with direct corrections at the exchange level must yield accurate doubles in the weakly correlated limit. We illustrate with exact calculations and analytic results on the Hubbard dimer. Lastly, we also explain the error in formal arguments in TDDFT.
- Authors:
-
- Univ. of California, Irvine, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, Irvine, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1595108
- Alternate Identifier(s):
- OSTI ID: 1475243
- Grant/Contract Number:
- FG02-08ER46496
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 149; Journal Issue: 13; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Sagredo, Francisca, and Burke, Kieron. Accurate double excitations from ensemble density functional calculations. United States: N. p., 2018.
Web. doi:10.1063/1.5043411.
Sagredo, Francisca, & Burke, Kieron. Accurate double excitations from ensemble density functional calculations. United States. https://doi.org/10.1063/1.5043411
Sagredo, Francisca, and Burke, Kieron. Tue .
"Accurate double excitations from ensemble density functional calculations". United States. https://doi.org/10.1063/1.5043411. https://www.osti.gov/servlets/purl/1595108.
@article{osti_1595108,
title = {Accurate double excitations from ensemble density functional calculations},
author = {Sagredo, Francisca and Burke, Kieron},
abstractNote = {The recent use of a new ensemble in density functional theory (DFT) to produce direct corrections to the Kohn-Sham transitions yields the elusive double excitations that are missed by time-dependent DFT (TDDFT) with the standard adiabatic approximation. But accuracies are lower than for single excitations, and formal arguments about TDDFT suggest that a correction kernel is needed. In principle, ensemble DFT with direct corrections at the exchange level must yield accurate doubles in the weakly correlated limit. We illustrate with exact calculations and analytic results on the Hubbard dimer. Lastly, we also explain the error in formal arguments in TDDFT.},
doi = {10.1063/1.5043411},
journal = {Journal of Chemical Physics},
number = 13,
volume = 149,
place = {United States},
year = {Tue Oct 02 00:00:00 EDT 2018},
month = {Tue Oct 02 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
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