# GW/QSGW L2 Seed Note

This note records the bounded manual curation used to seed reusable `L2`
knowledge for the GW/QSGW direction on 2026-04-17.

The seed is intentionally scoped to charged-excitation reasoning and QSGW gap
benchmark workflows that are already relevant to repository topics such as:

- `molecular-qsgw-convergence-and-reproducibility`
- `librpa-qsgw-convergence-verification-for-h2o-tight-basis`
- `jcp-qsgw-revision-ri-v-vs-lri-and-molecular-pulay-aux-basis-tests`
- `fhi-aims-librpa-molecular-g0w0-comparison`
- `green-function-topology-in-librpa`

Primary literature anchors used across the seed:

- L. Hedin, "New Method for Calculating the One-Particle Green's Function with Application to the Electron-Gas Problem" (1965)
- M. S. Hybertsen and S. G. Louie, "Electron correlation in semiconductors and insulators: Band gaps and quasiparticle energies" (1986)
- F. Aryasetiawan and O. Gunnarsson, "The GW method" (1998)
- G. Onida, L. Reining, and A. Rubio, "Electronic excitations: density-functional versus many-body Green's-function approaches" (2002)
- M. van Schilfgaarde, T. Kotani, and S. Faleev, "Quasiparticle self-consistent GW theory" (2006)

The seed keeps two honesty boundaries explicit:

1. RPA screening and GW self-energies are useful but not universally adequate.
2. QSGW convergence workflows are reusable route memory, not blanket claims of
   quantitative success for every correlated regime.
