Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 33: Correlated Electrons: Method Development 1
TT 33.6: Talk
Wednesday, March 18, 2020, 10:45–11:00, HSZ 201
Single-boson exchange decomposition of the vertex function — •Friedrich Krien1,3, Angelo Valli2,3, and Massimo Capone3 — 1Institut Jozef Stefan, Ljubljana, Slovenia — 2TU Wien, Austria — 3SISSA, Trieste, Italy
We present a decomposition of the four-point vertex function which imparts a physical interpretation of the vertex in terms of the exchange of bosons of three flavors. The proposed decomposition does not require the matrix inversion of the Bethe-Salpeter equation and avoids the vertex divergences intrinsic to the traditional parquet decomposition. We discuss parametrizations of the vertex function in terms of the Hedin three-leg vertex.