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Article Dans Une Revue Physical Review Letters Année : 2005

Many-body perturbation theory using the density-functional concept: beyond the GW approximation

Résumé

We propose an alternative formulation of Many-Body Perturbation Theory that uses the densityfunctional concept. Instead of the usual four-point integral equation for the polarizability, we obtain a two-point one, that 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 any level of approximation. Moreover, we show the direct impact of this formulation on the timedependent density-functional theory. Numerical results for the band gap of bulk silicon and solid argon illustrate corrections beyond the GW approximation for the self-energy.
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Dates et versions

hal-00016626 , version 1 (06-01-2006)

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  • HAL Id : hal-00016626 , version 1

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Fabien Bruneval, Francesco Sottile, Valério Olevano, Rodolfo del Sole, Lucia Reining. Many-body perturbation theory using the density-functional concept: beyond the GW approximation. Physical Review Letters, 2005, 94, pp.186402. ⟨hal-00016626⟩
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