Speaker
Dr
Joerg Schaefer
(University of Wuerzburg, Department of Physics)
Description
The spin texture of the metallic two-dimensional electron system formed by Au on 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 a 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 toward 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.
Primary author
Dr
Joerg Schaefer
(University of Wuerzburg, Department of Physics)
