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quant-ph2024
An attractive way to correct for missing singles excitations in unitary coupled cluster doubles theory
Zachary W. Windom, Daniel Claudino, Rodney J. Bartlett
Coupled cluster methods based exclusively on double excitations are comparatively "cheap" and interesting model chemistries, as they are typically able to capture the bulk of the d…
quant-ph2023
Nonconvergence of the Feynman-Dyson diagrammatic perturbation expansion of propagators
So Hirata, Ireneusz Grabowski, J. V. Ortiz +1
Using a general-order ab initio many-body Green's function method, we numerically illustrate several pathological behaviors of the Feynman-Dyson diagrammatic perturbation expansion…