Band structure effects on the Be(0001) acoustic-surface-plasmon energy dispersion
| Autor: | Silkin, V. M., Pitarke, J. M., Chulkov, E. V., Diaconescu, B., Pohl, K., Vattuone, L., Savio, L., Hoffmann, Ph., Farias, D., Rocca, M., Echenique, P. M. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys. Stat. Sol. (a) 205, 1307 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1002/pssa.200778156 |
| Popis: | 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 {\it map} the electron-hole excitation spectrum of the quasi two-dimensional Shockley surface state band that is present on the Be(0001) surface. Comment: 9 pages, 2 figures |
| Databáze: | arXiv |
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