Sodium: a charge-transfer insulator at high pressures.

@article{Gatti2010SodiumAC,
  title={Sodium: a charge-transfer insulator at high pressures.},
  author={M. Gatti and I. Tokatly and {\'A}. Rubio},
  journal={Physical review letters},
  year={2010},
  volume={104 21},
  pages={
          216404
        }
}
By first-principles methods we analyze the optical response of transparent dense sodium as a function of applied pressure. We discover an unusual kind of charge-transfer exciton that proceeds from the interstitial distribution of valence electrons. The absorption spectrum is strongly anisotropic, which, just at pressures above the metal-insulator transition, manifests as sodium being optically transparent in one direction but reflective in the other. This result provides key information about… Expand

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