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Lifetimes and mean-free paths of hot electrons in the alkali metals

AuthorsDolado, Jorge S.; Silkin, Viatcheslav M.; Cazalilla, M. A. ; Rubio, Angel; Echenique, Pedro M.
Issue DateOct-2001
PublisherAmerican Physical Society
CitationPhysical Review B 64: 195128 (2001)
AbstractWe report first principle calculations of electron and hole inelastic lifetimes for alkali metals (Na and K) within the framework of the GW approximation of many-body theory. The results show that at low energies the lifetimes are slightly smaller than prediction of a free-electron model, and that there is no noticeable momentum-direction dependence. We also look at the inelastic mean-free path λ, and conclude that the observed drops at a few eV in λ for the alkali elements with a strong d-band character cannot be attributed to the effect of these d bands in the lifetime, but to a crossover behavior of the velocity of the photoelectron.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.64.195128
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