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Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: Focus Session: Spins on Surfaces II (joint session O/MA)

MA 49.5: Vortrag

Donnerstag, 4. April 2019, 16:15–16:30, H15

Anisotropic spin-split surface states in momentum space from molecular adsorption — •Rico Friedrich1,2, Vasile Caciuc1, Bernd Zimmermann1, Gustav Bihlmayer1, Nicolae Atodiresei1, and Stefan Blügel11Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany — 2Present address: Center for Materials Genomics, Duke University, Durham, NC 27708, USA

Achieving control over the surface state spin texture can open new prospects in spintronics. We have recently demonstrated from first principles that the spin texture of a surface Rashba system can be controlled by the adsorption of molecules [1].

The molecular adsorption can also be employed to modulate the surface electronic structure in different momentum space directions, creating anisotropic spin splittings in k-space [2]. This effect is caused by an asymmetric adsorption of the molecules. Physisorbed NH3 gives rise to variations of the surface state Rashba parameters up to a factor of 1.4 over the surface Brillouin zone. In contrast, chemisorption of BH3 leads to variations by more than a factor of 2.5. Consequently, the anisotropy carries over to a modulation of the surface state spin texture: the spin direction can be changed from in-plane to predominantly out-of-plane by modifying the electronic momentum by 90.
R. Friedrich, et al., New J. Phys. 19, 043017 (2017).
R. Friedrich, et al., Phys. Rev. B 96, 085403 (2017).
This work was supported by the Volkswagen-Stiftung (Optically Controlled Spin Logic project) and DFG SFB 1238 (Project C01).

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