Phonon dispersion at the Be(0001) surface
- 15 January 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 53 (4), 2090-2100
- https://doi.org/10.1103/physrevb.53.2090
Abstract
Measurements of surface-phonon dispersion at the Be(0001) surface are reported that are found to differ significantly from the predictions of an accurate model of the truncated bulk: the sign of the Rayleigh wave dispersion along the zone boundary is reversed in theory and experiment. The measured dispersion implies a reduction in the magnitude of noncentral forces at the surface. Such a reduction is compatible with the electronic structure of the Be(0001) surface, which is more free-electron-like than that of bulk Be due to a high density of surface states. We conclude that the properties of the surface states dominate the dynamics of surface atoms.Keywords
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