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Title

Linear response time-dependent density functional theory of the Hubbard dimer

AuthorsCarrascal, Diego ; Ferrer, Jaime ; Maitra, Neepa; Burke, Kieron
Issue Date2018
PublisherSpringer Nature
CitationEuropean Physical Journal B 91: 142 (2018)
AbstractThe asymmetric Hubbard dimer is used to study the density-dependence of the exact frequency-dependent kernel of linear-response time-dependent density functional theory. The exact form of the kernel is given, and the limitations of the adiabatic approximation utilizing the exact ground-state functional are shown. The oscillator strength sum rule is proven for lattice Hamiltonians, and relative oscillator strengths are defined appropriately. The method of Casida for extracting oscillator strengths from a frequency-dependent kernel is demonstrated to yield the exact result with this kernel. An unambiguous way of labelling the nature of excitations is given. The fluctuation-dissipation theorem is proven for the ground-state exchange-correlation energy. The distinction between weak and strong correlation is shown to depend on the ratio of interaction to asymmetry. A simple interpolation between carefully defined weak-correlation and strong-correlation regimes yields a density-functional approximation for the kernel that gives accurate transition frequencies for both the single and double excitations, including charge-transfer excitations. Many exact results, limits, and expansions about those limits are given in the Appendices.
Publisher version (URL)https://doi.org/10.1140/epjb/e2018-90114-9
URIhttp://hdl.handle.net/10261/173624
Identifiersdoi: 10.1140/epjb/e2018-90114-9
e-issn: 1434-6036
issn: 1436-6028
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