Nonlinear density response from imaginary-time correlation functions: Ab initio path integral Monte Carlo simulations of the warm dense electron gas.

@article{Dornheim2021NonlinearDR,
  title={Nonlinear density response from imaginary-time correlation functions: Ab initio path integral Monte Carlo simulations of the warm dense electron gas.},
  author={Tobias Dornheim and Zhandos A. Moldabekov and Jan Vorberger},
  journal={The Journal of chemical physics},
  year={2021},
  volume={155 5},
  pages={
          054110
        }
}
The ab initio path integral Monte Carlo (PIMC) approach is one of the most successful methods in quantum many-body theory. A particular strength of this method is its straightforward access to imaginary-time correlation functions (ITCFs). For example, the well-known density-density ITCF F(q, τ) allows one to estimate the linear response of a given system for all wave vectors q from a single simulation of the unperturbed system. Moreover, it constitutes the basis for the reconstruction of the… 
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