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Physics > Chemical Physics
Title: Comparing self-consistent GW and vertex corrected G0W0 (G0W0Γ) accuracy for molecular ionization potentials
(Submitted on 20 Nov 2023 (v1), last revised 5 Apr 2024 (this version, v2))
Abstract: We test the performance of self-consistent GW and several representative implementations of vertex corrected G0W0 (G0W0{\Gamma}). These approaches are tested on benchmark data sets covering full valence spectra (first ionization potentials and some inner valence shell excitations). For small molecules, when comparing against state of the art wave function techniques, our results show that performing full self-consistency in the GW scheme either systematically outperforms vertex corrected G0W0 or gives results of at least the same quality. Moreover, the G0W0{\Gamma} results in additional computational cost when compared to G0W0 or self-consistent GW and the G0W0{\Gamma} dependency on the starting mean-filed solution is frequently larger than the magnitude of the vertex correction. Consequently, for molecular systems self-consistent GW performed on imaginary axis and then followed by modern analytical continuation techniques offers a more reliable approach to make predictions of IP spectra.
Submission history
From: Ming Wen [view email][v1] Mon, 20 Nov 2023 21:55:41 GMT (223kb,D)
[v2] Fri, 5 Apr 2024 20:29:29 GMT (524kb,D)
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