SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 78: Poster Session VI: 2D Materials: Electronic structure, excitations, etc. II

O 78.3: Poster

Mittwoch, 3. März 2021, 13:30–15:30, P

Spin-polarized VLEED from single-layer MoS2/Au(111): Investigation of spin-orbit-induced effects — •Christoph Angrick1, Annika Henriksen1, Nicole Mutzke1, Andre Reimann1, Moritz Ewert2,3, Lars Buss2,3, Jens Falta3, Jan Ingo Flege2,3, and Markus Donath11University of Münster, Germany — 2Brandenburg University of Technology Cottbus-Senftenberg, Germany — 3University of Bremen, Germany

The influence of spin-orbit interaction on low-energy electron reflection from single-layer MoS2 on Au(111) was studied by VLEED (very-low-energy electron diffraction) [1,2]. The spin-dependent electron reflection was investigated for a wide range of electron incidence angles and kinetic energies. Since the adlayer coverage is about 30%, we studied the Au(111) substrate and a MoS2 bulk sample for comparison. This approach enabled us to distinguish between adlayer and substrate signals.

For MoS2/Au(111), we detected a spin asymmetry of the reflected intensities, which shows a characteristic feature with alternating sign in the energy region of a VLEED fine structure [1]. The Au(111) substrate, in contrast, shows qualitatively different spin-asymmetry features, partially with reversed sign compared with MoS2/Au(111). The results of bulk MoS2 confirm that the characteristic feature in the single-layer data originates from MoS2. The influence of the adlayer-substrate interaction on the results will be discussed.

[1] Burgbacher et al., Phys. Rev. B 87, 195411 (2013)

[2] Angrick et al., J. Phys.: Condens. Matter 33, 115001 (2020)

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