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Sodium: A charge-transfer insulator at high pressures

AuthorsGatti, Matteo; Tokatly, I. V. ; Rubio, Angel
Issue Date2010
PublisherAmerican Physical Society
CitationPhysical Review Letters 104(21): 216404 (2010)
AbstractBy 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.
Description4 páginas, 3 figuras.-- PACS numbers: 71.35.Cc, 61.50.Ks, 71.20.Dg, 78.40.-q
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.104.216404
Appears in Collections:(CFM) Artículos
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