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Role of occupied d states in the relaxation of hot electrons in Au

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PhysRevB.62.1500-Prep.pdf (283.7Kb)
Date
2000-07-15
Author
Campillo Santos, Igor
Pitarke de la Torre, José María
Rubio, A.
Echenique Landiribar, Pedro Miguel
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Physical Review B 62(3) : 1500-1503 (2000)
URI
http://hdl.handle.net/10810/2608
Abstract
We present first-principles calculations of electron-electron scattering rates of low-energy electrons in Au. Our full band-structure calculations indicate that a major contribution from occupied d states participating in the screening of electron-electron interactions yields lifetimes of electrons in Au with energies of 1.0-3.0 eV above the Fermi level that are larger than those of electrons in a free-electron gas by a factor of similar to 4.5. This prediction is in agreement with a recent experimental study of ultrafast electron dynamics in Au(111) films [J. Cao er al., Phys. Rev. B 58, 10 948 (1998)], where electron transport has been shown to play a minor role in the measured lifetimes of hot electrons in this material.
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