Two-Dimensional Metallicity with a Large Spin-Orbit Splitting: DFT Calculations of the Atomic, Electronic, and Spin Structures of the Au/Ge(111)- Surface

Figure 5

(a) Real-space top view of the CHCT structure with three mirror-plane symmetries , , and shown as red, dashed lines. (b) The surface Brillouin zone of the unit cell. The red, dashed lines show the orientation of the three mirror planes in the reciprocal space. The six symmetry operations of the group transform one of the irreducible parts of the BZ, called , into other irreducible parts. A possible constant-energy contour is shown as a solid line within the BZ together with a possible spin texture along the contour shown as color arrows. Red color of arrows corresponds to one possible direction of spin vectors; blue color corresponds to the opposite direction. The green color of spin vectors along the lines means fully planar spins.

(a)

(b)