@article{362,
  keywords = {paper, TDDFT},
  author = {Francesco Sottile and Olevano V and Lucia Reining},
  title = {Parameter-free calculation of response functions in time-dependent density-functional theory},
  abstract = {We have established and implemented a fully ab initio method which allows one to calculate optical absorption spectra, including excitonic effects, without solving the cumbersome Bethe-Salpeter equation, but obtaining results of the same precision. This breakthrough has been achieved in the framework of time-dependent density-functional theory, using new exchange-correlation kernels f(xc) that are free of any empirical parameter. We show that the same excitonic effects in the optical spectra can be reproduced through different f(xc)\textquoterights, ranging from frequency-dependent ones to a static one, by varying the kernel\textquoterights spatial degrees of freedom. This indicates that the key quantity is not f(xc), but f(xc) combined with a response function. We present results for the optical absorption of bulk Si and SiC in good agreement with experiment, almost indistinguishable from those of the Bethe-Salpeter approach.},
  year = {2003},
  journal = {Phys. Rev. Lett.},
  volume = {91},
  number = {5},
  pages = {056402},
  month = {AUG 1},
  publisher = {AMERICAN PHYSICAL SOC},
  address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
  url = {http://dx.doi.org/10.1103/PhysRevLett.91.056402},
  doi = {10.1103/PhysRevLett.91.056402},
}