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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/9904
Multipole surface-plasmon modes on simple metals
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The average multipole surface-plasmon energy for simple metals, as well as that of ordinary surface and bulk plasmons, is obtained using energy-weighted moments of the electronic response to sufficiently general external perturbations. A local approximation of exchange and correlation effects is used within a jellium model. Band-structure effects are incorporated through an effective electronic mass. Taking advantage of the transparency of the method, we analyze under what circumstances such modes might be observable. It is shown that due to an interplay between Coulomb and kinetic energies, the multipole modes become unobservable for increasing values of the transferred momentum (q) parallel to the surface. The value of q at which the multipole mode becomes unobservable is much smaller than the cutoff value for Landau damping. The effect of the electronic surface diffuseness is also analyzed. We compare our results with previous density-functional calculations and with recent experimental data for Na, K, and Cs.
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SELLARÈS GONZÁLEZ, Jordi and BARBERÁN FALCÓN, Núria. Multipole surface-plasmon modes on simple metals. Physical Review B. 1994. Vol. 50, num. 3, pags. 1879-1887. ISSN 0163-1829. [consulted: 7 of August of 2026]. Available at: https://hdl.handle.net/2445/9904