@article{BarthelSchollwockWhite2009,
  author    = {Barthel, Thomas and Schollwock, Ulrich and White, Steven R.},
  title     = {Spectral functions in one-dimensional quantum systems at finite temperature using the density matrix renormalization group},
  issn      = {1098-0121},
  doi       = {10.1103/Physrevb.79.245101},
  year      = {2009},
  abstract  = {We present time-dependent density matrix renormalization group simulations (t-DMRG) at finite temperatures. It is demonstrated how a combination of finite-temperature t-DMRG and time-series prediction allows for an easy and very accurate calculation of spectral functions in one-dimensional quantum systems, irrespective of their statistics for arbitrary temperatures. This is illustrated with spin structure factors of XX and XXX spin-1/2 chains. For the XX model we can compare against an exact solution, and for the XXX model (Heisenberg antiferromagnet) against a Bethe ansatz solution and quantum Monte Carlo data.},
  language  = {en}
}