@article{342,
  keywords = {paper},
  author = {Hans-Christian Weissker and J Serrano and Simo Huotari and Fabien Bruneval and Francesco Sottile and G Monaco and M Krisch and Olevano V and Lucia Reining},
  title = {Signatures of short-range many-body effects in the dielectric function of silicon for finite momentum transfer},
  abstract = {We present an investigation of the dynamic structure factor and of the dielectric function epsilon(M)(Q,omega) of the prototypical semiconductor silicon for finite momentum transfer, combining inelastic x-ray scattering experiments and ab initio calculations. In contrast with optical spectra, for finite momentum transfer time-dependent density-functional theory in the adiabatic local-density approximation together with lifetime broadening describes the physics of valence excitations correctly. Major structures in the spectra, governed by short-range crystal and exchange-correlation local-field effects, are strongly influenced by a mixing of transitions of positive and negative energies, in striking difference to spectra for vanishing momentum transfer. This mixing gives rise to a pronounced Fano asymmetry.},
  year = {2006},
  journal = {Phys. Rev. Lett.},
  volume = {97},
  number = {23},
  pages = {237602},
  month = {DEC 8},
  publisher = {AMERICAN PHYSICAL SOC},
  address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
  url = {http://dx.doi.org/10.1103/PhysRevLett.97.237602},
  doi = {10.1103/PhysRevLett.97.237602},
}