Validation of the GreenX library time-frequency component for efficient GW and RPA calculations

Maryam Azizi, Jan Wilhelm, Dorothea Golze, Francisco A. Delesma, Ramón L. Panadés-Barrueta, Patrick Rinke, Matteo Giantomassi, Xavier Gonze

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

1 Sitaatiot (Scopus)
40 Lataukset (Pure)

Abstrakti

Electronic structure calculations based on many-body perturbation theory [e.g., GW or the random-phase approximation (RPA)] require function evaluations in the complex time and frequency domain, for example, inhomogeneous Fourier transforms or analytic continuation from the imaginary axis to the real axis. For inhomogeneous Fourier transforms, the time-frequency component of the GreenX library provides time-frequency grids that can be utilized in low-scaling RPA and GW implementations. In addition, the adoption of the compact frequency grids provided by our library also reduces the computational overhead in RPA implementations with conventional scaling. In this paper, we present low-scaling GW and conventional RPA benchmark calculations using the GreenX grids with different codes (FHI-aims, CP2K, and ABINIT) for molecules, two-dimensional materials and solids. Very small integration errors are observed when using 30 time-frequency points for our test cases, namely <10-8 eV/electron for the RPA correlation energies, and ≤10 meV for the GW quasiparticle energies.

AlkuperäiskieliEnglanti
Artikkeli245101
Sivut1-15
Sivumäärä15
JulkaisuPhysical Review B
Vuosikerta109
Numero24
DOI - pysyväislinkit
TilaJulkaistu - 15 kesäk. 2024
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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