Sodium: a charge-transfer insulator at high pressures.

  title={Sodium: a charge-transfer insulator at high pressures.},
  author={Matteo Gatti and Ilya V. Tokatly and {\'A}ngel Rubio},
  journal={Physical review letters},
  volume={104 21},
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… 

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Solid-State Physics
These are a set of notes I have made, based on lectures given by M.Moore at the University of Manchester Jan-June ’08. Please e-mail me with any comments/corrections:
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