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Absolute energy levels of liquid water from many-body perturbation theory with effective vertex corrections.
Tal, Alexey; Bischoff, Thomas; Pasquarello, Alfredo.
Afiliação
  • Tal A; Chaire de Simulation à l'Echelle Atomique, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland.
  • Bischoff T; Chaire de Simulation à l'Echelle Atomique, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland.
  • Pasquarello A; Chaire de Simulation à l'Echelle Atomique, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland.
Proc Natl Acad Sci U S A ; 121(10): e2311472121, 2024 Mar 05.
Article em En | MEDLINE | ID: mdl-38427604
ABSTRACT
We demonstrate the importance of addressing the Γ vertex and thus going beyond the GW approximation for achieving the energy levels of liquid water in many-body perturbation theory. In particular, we consider an effective vertex function in both the polarizability and the self-energy, which does not produce any computational overhead compared with the GW approximation. We yield the band gap, the ionization potential, and the electron affinity in good agreement with experiment and with a hybrid functional description. The achieved electronic structure and dielectric screening further lead to a good description of the optical absorption spectrum, as obtained through the solution of the Bethe-Salpeter equation. In particular, the experimental peak position of the exciton is accurately reproduced.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Suíça

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Suíça