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The role of an electronic surface state in the stopping power of a swift charged particle in front of a metal

AuthorsSilkin, Viatcheslav M.; Alducin Ochoa, Maite CSIC ORCID ; Juaristi Oliden, Joseba Iñaki CSIC ORCID; Chulkov, Eugene V. CSIC ORCID; Echenique, Pedro M. CSIC
KeywordsNoble metal surfaces
Surface electronic structure
Slow charged particle
Stopping power
Friction coefficient
Surface state Fermi velocity
Issue Date8-Jul-2008
PublisherInstitute of Physics Publishing
CitationJournal of Physics: Condensed Matter 20: 304209 (2008)
AbstractWe study the stopping power and friction coefficient of a slow charged particle moving parallel to noble metal (111) surfaces. In the description of the surface electronic structure, information about a wide energy gap at the surface Brillouin zone, at the Fermi level, and the partly occupied s–p_z surface state is introduced via the use of a model potential. The stopping power, S(b,υ), and friction coefficient, γ(b,υ), versus the projectile velocity υ and its distance from the surface b are investigated within linear response theory with self-consistent evaluation of the surface response function. The present calculations demonstrate the striking differences in the behavior of S(b,υ) and γ(b,υ) in comparison with those obtained from simpler models. In particular, for very low velocities, S(b,υ) and γ(b,υ) decay as b^−3 at large b, mainly due to the electron–hole excitations within the surface state, instead of the ~b^−4 behavior expected from a jellium model. For velocities close to the surface state Fermi velocity, υ_F^SS, the energy losses with characteristic ~b^−2 decay are dominated by the excitation of the acoustic surface plasmons that can exist at some surfaces with partly occupied surface states.
Description7 pages, 10 figures.-- Printed version published on Jul 30, 2008.
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