Scattering at magnetic and nonmagnetic impurities on surfaces with strong spin-orbit coupling

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Lükermann, D.; Sologub, S.; Pfnür, H.; Klein, C.; Horn-Von Hoegen, M.; Tegenkamp, C.: Scattering at magnetic and nonmagnetic impurities on surfaces with strong spin-orbit coupling. In: Physical Review B - Condensed Matter and Materials Physics 86 (2012), Nr. 19, No. 195432. DOI: https://doi.org/10.1103/PhysRevB.86.195432

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Abstract: 
Adsorption-induced reduction of surface-state conductivity in epitaxial Bi(111) films, a prototype system with large Rashba-induced surface-state splitting, by adsorbed atoms of Bi, Fe, and Co has been investigated by macroscopic surface magnetotransport measurements at a temperature of 10 K. A detailed analysis of magnetotransport, dc transport, and Hall data reveals that the scattering efficiencies for Co and Fe are larger by a factor of 2 than that for Bi. While for the latter charge transfer and change of band filling near the Fermi level are negligible, we find an increase of hole concentration upon Co and Fe adsorption. These atoms act as acceptors and immobilize on average about 0.5 electrons per adsorbed atom. Besides the dominant classical magnetoconductance signal the films show signatures of weak antilocalization, reflecting the strong spin-orbit coupling in Bi(111) surface states. This behavior can be changed to weak localization by the adsorption of high concentrations (0.1 monolayers) of magnetic impurities (Fe,Co), similarly to results found on the topological insulator Bi2Se3. Our results demonstrate that details of chemical bond formation for impurities are crucial for local spin moments and electronic scattering properties. © 2012 American Physical Society.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2012
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of Germany Germany 65 71.43%
2 image of flag of United States United States 8 8.79%
3 image of flag of China China 8 8.79%
4 image of flag of Taiwan Taiwan 2 2.20%
5 image of flag of Libya Libya 2 2.20%
6 image of flag of Italy Italy 1 1.10%
7 image of flag of France France 1 1.10%
8 image of flag of Spain Spain 1 1.10%
9 image of flag of Colombia Colombia 1 1.10%
10 image of flag of Australia Australia 1 1.10%
    other countries 1 1.10%

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