Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session G46: Excited State I: Method development: Many-Body Perturbation Theory
11:30 AM–2:30 PM,
Tuesday, March 15, 2022
Room: McCormick Place W-470A
Sponsoring Units: DCOMP DMP
Chair: Feliciano Giustino, University of Texas
Abstract: G46.00010 : Photoemission spectroscopy from the three-body Green's function.
1:42 PM–1:54 PM
The main goal is to go beyond the standard Green's function approaches, such as the GW method, in order to find a good description not only of the quasiparticles but also of the satellite structures, which are of particular importance in strongly correlated materials.
Our method uses as a key quantity the three-body Green's function, or, more precisely, its hole-hole-electron and electron-electron-hole parts.
We show that, contrary to the one-body Green's function, satellites are already present in the corresponding non-interacting Green's function. Therefore, simple approximations to the three-body self-energy, which is defined by the Dyson equation for the three-body Green's function and which contains many-body effects, can still yield accurate spectral functions. In particular, the self-energy can be chosen to be static which could simplify a self-consistent solution of the Dyson equation.
We also show how the one-body Green's function can be retrieved from the three-body Green's function.
We illustrate our approach by applying it to the symmetric Hubbard dimer.
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