Corpus ID: 118576709

Adjacent Pairs Exchange correction to the Random Phase Approximation

  title={Adjacent Pairs Exchange correction to the Random Phase Approximation},
  author={Felix Hummel},
  journal={arXiv: Materials Science},
  • Felix Hummel
  • Published 1 September 2015
  • Physics
  • arXiv: Materials Science
The Random Phase Approximation (RPA) is a widely employed post Hartree-Fock or DFT method, capable of capturing van der Waal interactions and other dynamic correlation effects at relatively low costs of $\mathcal O(N^3)$ in time and $\mathcal O(N^2)$ in memory, if calculated from imaginary time propagators. However, since it neglects anti-symmetrization RPA is biased, overestimating the correlation energy and bond lengths in general. The Second Order Screened Exchange offers amelioration by… Expand


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