Surface Phonons
نویسندگان
چکیده
منابع مشابه
Phonons at the Fe(110) surface.
The in-plane density of phonon states of clean Fe(110) surface was measured separately for the first, second, and further atomic monolayers using nuclear inelastic scattering of synchrotron radiation. The results show that atoms of the first layer vibrate with frequencies significantly lower and amplitudes much larger than those in the bulk, and that vibrational spectra along two perpendicular ...
متن کاملGRAPHITE SURFACE PHONONS STUDIED THROUGH He ATOMS RESONANT SCATTERING
He atom scattering has been used to study phonon-assi sted bound state resonances and the Debye-Waller Factor for the basal plane of graphite. A dispersion relation is reported for the surface phonons involved in the resonances. The attenuation of the specxlar peak in the temperature range from 20 to 315 K is used to derive the mean-square displacement (u?) of surface atoms, perpendicular to th...
متن کاملLaser-induced surface phonons and their excitation of nanostructures
Information about deformations of nanostructures in the gigahertz regime is rather sparse until now. Especially deformations after irradiation with short laser pulses have been studied only recently; see [1] and according references therein. Our work aims at creating surface phonons or surface acoustic waves (SAW) [2] in the gigahertz (GHz) range based on short laser pulse techniques and to emp...
متن کاملTheory of surface phonons at metal surfaces: recent advances.
Recent studies of the surface dynamics of Al(001) and Cu(111) based on density functional perturbation theory have substantiated the existence of subsurface optical phonon resonances of all three polarizations, thus confirming early predictions of the embedded-atom method. The hybridization of the shear-vertical optical resonance with the longitudinal acoustic phonon branch accounts for the ubi...
متن کاملRole of bulk and surface phonons in the decay of metal surface States.
We present a comprehensive theoretical investigation of the electron-phonon contribution to the lifetime broadening of the surface states on Cu(111) and Ag(111), in comparison with high-resolution photoemission results. The calculations, including electron and phonon states of the bulk and the surface, resolve the relative importance of the Rayleigh mode, being dominant for the lifetime at smal...
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ژورنال
عنوان ژورنال: Europhysics News
سال: 1992
ISSN: 0531-7479,1432-1092
DOI: 10.1051/epn/19922304063