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TT: Fachverband Tiefe Temperaturen

TT 33: Correlated Electrons: Method Development 1

TT 33.6: Vortrag

Mittwoch, 18. März 2020, 10:45–11:00, HSZ 201

Single-boson exchange decomposition of the vertex function — •Friedrich Krien1,3, Angelo Valli2,3, and Massimo Capone31Institut 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.

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DPG-Physik > DPG-Verhandlungen > 2020 > Dresden