Many-Body Approximation Scheme Beyond GW

Details Many-Body Approximation Scheme Beyond GW Many-Body Approximation Scheme Beyond GW

2003-12-11

arxiv.org/abs/cond-mat/0312303v2

Phys. Rev. Lett. 92, 196402 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 8 figures

Scientific paper

10.1103/PhysRevLett.92.196402

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 self-energies to infinite order in closed form and the latter handles the non-local ones to lowest order. We investigate the different levels of self-consistency that can be implemented within this method by comparing to the exact QMC solution of a finite-size model Hamiltonian. We find that using the EDMFT solution for the local self-energies as input to the GWA for the non-local self-energies gives the best result.

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