Band structure effects on the Be(0001) acoustic surface plasmon energy dispersion
- Silkin, V. M.
- Pitarke, J. M.
- Chulkov, E. V.
- Diaconescu, B.
- Pohl, K.
- Vattuone, Luca
- Savio, L.
- Hofmann, P. H.
- Farias, D.
- ROCCA MARIO AGOSTINO,
- Echenique, P. M.
DOIAbstract
We report first-principles calculations of acoustic surface plasmons on the (0001) surface of Be, as obtained in the random-phase approximation of many-body theory. The energy dispersion of these collective excitations has been obtained along two symmetry directions. Our results show a considerable anisotropy of acoustic surface plasmons, and underline the capability of experimental measurements of these plasmons to map the electron-hole excitation spectrum of the quasi two-dimensional Shockley surface state band that is present on the Be(0001) surface. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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