Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.216404
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Funding
- Spanish MEC [FIS2007-65702-C02-01]
- Grupos Consolidados UPV/EHU del Gobierno Vasco [IT-319-07]
- European Union [211956]
- Barcelona Supercomputing Center
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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 the crystal structure of transparent sodium, a new unconventional inorganic electride.
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