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dc.contributor.authorSilkin, Viatcheslav M.-
dc.contributor.authorAlducin Ochoa, Maite-
dc.contributor.authorJuaristi Oliden, Joseba Iñaki-
dc.contributor.authorChulkov, Eugene V.-
dc.contributor.authorEchenique, Pedro M.-
dc.identifier.citationJournal of Physics: Condensed Matter 20: 304209 (2008)en_US
dc.description7 pages, 10 figures.-- Printed version published on Jul 30, 2008.en_US
dc.description.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.en_US
dc.description.sponsorshipThis work has been partially funded by the University of the Basque Country UPV/EHU (Grant No. 9/UPV 00206.215-13639/2001), the Eusko Jaurlaritza, and the Spanish MCyT (Grant No. FIS2007-066711-CO2-00).en_US
dc.format.extent545129 bytes-
dc.publisherInstitute of Physics Publishingen_US
dc.subjectNoble metal surfacesen_US
dc.subjectSurface electronic structureen_US
dc.subjectSlow charged particleen_US
dc.subjectStopping poweren_US
dc.subjectFriction coefficienten_US
dc.subjectSurface state Fermi velocityen_US
dc.titleThe role of an electronic surface state in the stopping power of a swift charged particle in front of a metalen_US
dc.description.peerreviewedPeer revieweden_US
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