A Many-Body Approximation Scheme Beyond GW

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  • 11 December 2003
Abstract
We explore the combination of the extended dynamical mean field theory (EDMFT) with the GW approximation (GWA); the former sums the local contributions to the polarization and self-energy to infinite order in closed form and the latter handles the non-local ones at the leading order. We benchmark systematically the different levels of self-consistency that can be employed within this method using the exact QMC solution to a finite-size model Hamiltonian. We find the GWA, using as input the EDMFT solution of the local self-energies, gives the best result.

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