Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Electronic Structure of Surfaces: Magnetism and Spin Phenomena II
O 14.5: Vortrag
Montag, 20. März 2017, 16:00–16:15, WIL C107
Controlling the Rashba spin texture by adsorption of inorganic molecules — •Rico Friedrich, Vasile Caciuc, Gustav Bihlmayer, Nicolae Atodiresei, and Stefan Blügel — Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, D-52425 Jülich
We demonstrate from first principles that the spin texture of a surface Rashba system can be controlled by the adsorption of molecules. By making use of physisorbed and chemisorbed inorganic molecules on the BiAg2/Ag(111) surface alloy [1] we show that both the spin-orbit splitting and the spin direction of Rashba-split surface states can be manipulated selectively.
The physisorption of NH3 gives rise to a slightly enhanced outward buckling of the surface Bi which enlarges the magnitude of the Rashba splitting. On the contrary, the weak chemisorption of BH3 defines a strong inward relaxation of the surface Bi. This causes the occupied Rashba split state to shift into Ag bulk states. In addition a new Rashba splitting is created in an unoccupied state upon BH3 adsorption. Most importantly, in contrast to the clean surface [1,2] in case of the BH3-BiAg2/Ag(111) system the out-of-plane spin polarization is significantly larger than the in-plane one.
C. R. Ast et al., Physical Review Letters 98, 186807 (2007).
G. Bihlmayer et al., Physical Review B 75, 195414 (2007).
This work is supported by the Volkswagen-Stiftung through the Optically Controlled Spin Logic project and by DFG through SFB 1238 (Project C01).