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Título: | Lifetimes of low-energy electron excitations in metals |
Autor: | Zhukov, Vladlen P.; Chulkov, Eugene V. CSIC ORCID | Fecha de publicación: | 2002 | Editor: | IOP Publishing | Citación: | Journal of Physics: Condensed Matter 14(8): 1937 (2002) | Resumen: | We report theoretical studies of electron and hole lifetimes in a free-electron gas as well as in real metals Al and Nb by means of the ab initio many-body method and semi-empirical scattering theory approach. We show that for free-electron-like excitations a simple density-of-state convolution model of the scattering theory approach (STA-DOS) is a good approximation to the ab initio lifetimes, the energy dependence of the STA-DOS transition matrix element being rather unimportant. The approximation of energy-independent matrix element appears to also be reasonable for Nb. A good correspondence between the STA-DOS and ab initio momentum-averaged results is achieved for Nb with an adjusted matrix element, although the ab initio lifetimes disperse greatly with respect to the averaged value. | Versión del editor: | https://doi.org/10.1088/0953-8984/14/8/321 | URI: | http://hdl.handle.net/10261/225111 | DOI: | 10.1088/0953-8984/14/8/321 | ISSN: | 0953-8984 |
Aparece en las colecciones: | (CFM) Artículos |
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