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Título: | Enhanced Rashba spin-orbit splitting in Bi/Ag (111) and Pb/Ag (111) surface alloys from first principles |
Autor: | Bihlmayer, Gustav; Blügel, S.; Chulkov, Eugene V. CSIC ORCID | Fecha de publicación: | 2007 | Editor: | American Physical Society | Citación: | Physical Review B 75(19): 195414 (2007) | Resumen: | We present first-principles calculations of a (√3×√3)R30° Bi∕Ag(111)-ordered surface alloy, which has recently been investigated experimentally using angle-resolved photoemission spectroscopy. The surface states in the L-projected bulk band gap show a Rashba-type spin-orbit splitting which is three times larger than what has been observed on a clean Bi(111) surface. This large enhancement can be explained by the strong distortion of the surface-state wave function which is caused by the substantial outward buckling of the Bi atom. Also, in a similar surface alloy, Pb∕Ag(111), a strong Rashba-type splitting was found by our calculations. The comparison to the experimental data is more difficult due to the presence of a second, close-by surface state. We discuss the dependence of the two-dimensional band structure on the surface corrugation and compare to the experimental findings. | Versión del editor: | https://doi.org/10.1103/PhysRevB.75.195414 | URI: | http://hdl.handle.net/10261/224660 | DOI: | 10.1103/PhysRevB.75.195414 | ISSN: | 2469-9950 |
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