@article{346,
  keywords = {paper},
  author = {Fabien Bruneval and Francesco Sottile and Olevano V and Rodolfo Del Sole and Lucia Reining},
  title = {Many-body perturbation theory using the density-functional concept: Beyond the GW approximation},
  abstract = {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 any level of approximation. Moreover, we show the direct impact of this formulation on the time-dependent 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.},
  year = {2005},
  journal = {Phys. Rev. Lett.},
  volume = {94},
  number = {18},
  pages = {186402},
  publisher = {AMERICAN PHYSICAL SOC},
  address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
  url = {http://dx.doi.org/10.1103/PhysRevLett.94.186402},
  doi = {10.1103/PhysRevLett.94.186402},
}