AB-G$_0$W$_0$: A practical G$_0$W$_0$ method without frequency integration based on an auxiliary boson expansion

Johannes Tölle; Garnet Kin-Lic Chan

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arXiv · 2311.18304

AB-G$_0$W$_0$: A practical G$_0$W$_0$ method without frequency integration based on an auxiliary boson expansion

Johannes Tölle·Garnet Kin-Lic Chan

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Abstract

Common G$_0$W$_0$ implementations rely on numerical or analytical frequency integration to determine the G$_0$W$_0$ self-energy, which results in a variety of practical complications. Recently, we demonstrated an exact connection between the G$_0$W$_0$ approximation and equation-of-motion (EOM) quantum chemistry approaches [J. Chem. Phys., 158, 124123 (2023)]. Based on this connection, we propose a new method to determine G$_0$W$_0$ quasiparticle energies which completely avoids frequency integration and its associated problems. To achieve this, we make use of an auxiliary boson (AB) expansion. We name the new approach AB-G$_0$W$_0$ and demonstrate its practical applicability in a range of molecular problems.

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Johannes Tölle, Garnet Kin-Lic Chan. 2023-11-30. AB-G$_0$W$_0$: A practical G$_0$W$_0$ method without frequency integration based on an auxiliary boson expansion. https://arxiv.org/abs/2311.18304

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