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Title: Exploiting a derivative discontinuity estimate for accurate G0W0 ionization potentials and electron affinities

Journal Article · · Electronic Structure

The GW approximation has become an important tool for predicting charged excitations of isolated molecules and condensed systems. Its popularity can be attributed to many factors, including a favorable scaling and relatively good accuracy. In practical applications, the GW is often performed as a one-shot perturbation known as $$G_0W_0$$. Unfortunately, $$G_0W_0$$ suffers from a strong starting point dependence and is often not as accurate as one would need. Self-consistent GW methodologies alleviate these problems but come with a marked increase in computational cost. In this manuscript, we propose the use of an estimate of the exchange-correlation derivative discontinuity to provide a remarkably good starting point for $$G_0W_0$$ calculations, yielding ionization potentials and electron affinities with eigenvalue self-consistent GW quality at no additional cost. We assess the quality of the resulting methodology with the GW100 benchmark set and compare its advantages over other similar methods.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-76RL01830; FWP 70942
OSTI ID:
2324678
Alternate ID(s):
OSTI ID: 2320281; OSTI ID: 2429499
Report Number(s):
PNNL-SA-193154
Journal Information:
Electronic Structure, Vol. 6, Issue 1; ISSN 2516-1075
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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