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• W3105114689 abstract "We benchmark many-body perturbation theory by studying neutral, as well as non-neutral, excitations of finite lattice systems. The neutral excitation spectra are obtained by time-propagating the Kadanoff-Baym equations in the Hartree-Fock and second Born approximations. Our method is equivalent to solving the Bethe-Salpeter equation with a high-level kernel while respecting self-consistently, which guarantees the fulfillment of a frequency sum rule. As a result, we find that a time-local method, such as Hartree-Fock, can give incomplete spectra, while already the second Born, which is the simplest time-nonlocal approximation, reproduces well most of the additional excitations, which are characterized as double-excitations." @default.
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• W3105114689 date "2012-01-18" @default.
• W3105114689 modified "2023-10-03" @default.
• W3105114689 title "The Kadanoff–Baym approach to double excitations in finite systems" @default.
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• W3105114689 doi "https://doi.org/10.1088/1367-2630/14/1/013032" @default.
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