The GW approximation in electronic structure theory has become a widespread tool for
predicting electronic excitations in chemical compounds and materials. In the realm of …

The GW approximation has recently gained increasing attention as a viable method for the
computation of deep core-level binding energies as measured by X-ray photoelectron …

In recent years, Green's function methods have garnered considerable interest due to their
ability to target both charged and neutral excitations. Among them, the well-established GW …

We derive the explicit expression of the three self-energies that one encounters in many-
body perturbation theory: the well-known GW self-energy, as well as the particle–particle …

Within many-body perturbation theory, Hedin's formalism offers a systematic way to
iteratively compute the self-energy Σ of any dynamically correlated interacting system …

Here, we build on the works of Scuseria et al.[J. Chem. Phys. 129, 231101 (2008)] and
Berkelbach [J. Chem. Phys. 149, 041103 (2018)] to show connections between the Bethe …

We developed an efficient active-space particle–particle random-phase approximation
(ppRPA) approach to calculate accurate charge-neutral excitation energies of molecular …

Due to the infinite summation of bubble diagrams, the GW approximation of Green's function
perturbation theory has proven particularly effective in the weak correlation regime, where …

Using the simple (symmetric) Hubbard dimer, we analyze some important features of the GW
approximation. We show that the problem of the existence of multiple quasiparticle solutions …

Photo-emission spectroscopy directly probes individual electronic states, ranging from
single excitations to high-energy satellites, which simultaneously represent multiple …