Berlin 2018 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 54: Focus Session: Frontiers of Electronic-Structure Theory: Correlated Electron Materials VI (joint session O/MM/DS/TT/CPP)
MM 54.2: Talk
Thursday, March 15, 2018, 10:45–11:00, HL 001
GW and beyond from matrix resolvents — •Jan Gesenhues1, Dmitrii Nabok2, Michael Rohlfing1, and Claudia Draxl2 — 1Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, 48149 Münster, Germany — 2Theoretische Festkörperphysik, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
Typically GW calculations make use of either plasmon pole models or numerical integration in order to determine the screened Coulomb interaction W. We demonstrate how to obtain an analytical representation of W with the help of a matrix resolvent and present some standard GW results which have been obtained with the method. The analytical W is a useful starting point for subsequent calculations involving vertex corrections. On the other hand, the matrix resolvent technique itself can be applied upon a BSE-like equation of motion for the polarizability to include vertex corrections.