Three-Dimensional Spin Rotations at the Fermi Surface of a Strongly Spin-Orbit Coupled Surface System
| Autor: | Hoepfner, Philipp, Schaefer, Joerg, Fleszar, Andrzej, Dil, Jan Hugo, Slomski, Bartosz, Meier, Fabian, Loho, Christoph, Blumenstein, Christian, Patthey, Luc, Hanke, Werner, Claessen, Ralph |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 108 (2012) 186801 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.108.186801 |
| Popis: | The spin texture of the metallic two-dimensional electron system (root3 x root3)-Au/Ge(111) is revealed by fully three-dimensional spin-resolved photoemission, as well as by density functional calculations. The large hexagonal Fermi surface, generated by the Au atoms, shows a significant splitting due to spin-orbit interactions. The planar components of the spin exhibit helical character, accompanied by a strong out-of-plane spin component with alternating signs along the six Fermi surface sections. Moreover, in-plane spin rotations towards a radial direction are observed close to the hexagon corners. Such a threefold-symmetric spin pattern is not described by the conventional Rashba model. Instead, it reveals an interplay with Dresselhaus-like spin-orbit effects as a result of the crystalline anisotropies. Comment: 5 pages, 4 figures, accepted at Physical Review Letters |
| Databáze: | arXiv |
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