%0 Journal Article
%A Friedrich, Rico
%A Caciuc, Vasile
%A Zimmermann, Bernd
%A Bihlmayer, Gustav
%A Atodiresei, Nicolae
%A Blügel, Stefan
%T Creating anisotropic spin-split surface states in momentum space by molecular adsorption
%J Physical review / B
%V 96
%N 8
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2017-05997
%P 085403
%D 2017
%X In this ab initio study we demonstrate that molecular adsorption on a surface Rashba system can be used to modulate the surface electronic structure in different momentum space directions, i.e., to create anisotropic spin splittings in k space. This effect is rooted in the asymmetric adsorption of the molecules on the surface in a hollow site which breaks the surface symmetry. More specifically, we demonstrate that the physisorbed NH3 has a small influence on the surface Rashba states and only gives rise to variations of the surface state Rashba parameters up to a factor of 1.4 over the surface Brillouin zone. In contrast, the chemisorption of BH3 leads to variations of the Rashba parameter by more than a factor of 2.5. Consequently, the anisotropy of the Rashba-split-surface states induced by molecular adsorption also gives rise to a modulation of the surface state spin texture, i.e., the out-of-plane spin polarization varies along different k directions by up to 70% for the occupied states. This offers the possibility to change the spin direction from in-plane to predominantly out-of-plane by modifying the electronic momentum by 90°.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000406752500005
%R 10.1103/PhysRevB.96.085403
%U https://juser.fz-juelich.de/record/836975