منابع مشابه
Many-body approximation scheme beyond GW.
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 nonlocal ones to lowest order. We investigate the different levels of self-consistency that can be implemented within this method by comparing to the exact quantum ...
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متن کاملMany-body perturbation theory using the density-functional concept: beyond the GW approximation.
We propose an alternative formulation of many-body perturbation theory that uses the density-functional concept. Instead of the usual four-point integral equation for the polarizability, we obtain a two-point one, which leads to excellent optical absorption and energy-loss spectra. The corresponding three-point vertex function and self-energy are then simply calculated via an integration, for a...
متن کاملLCAO method for finite-temperature systems and self-consistent perturbation scheme beyond the GW approximation
The linear combination of atomic orbitals (LCAO) method, which was originally developed for calculating the electronic structure of systems at zero temperature, is extended to treat finitetemperature systems. The new method yields an approximate free energy that is an upper bound to the true free energy of a real system. The approximate free energy is given in the space spanned by an LCAO basis...
متن کاملBeyond the GW approximation: A second-order screened exchange correction
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2004
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.92.196402