Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 48: 2D Materials 1: Electronic Structure of Transition Metal Dichalcogenides

O 48.7: Vortrag

Mittwoch, 7. September 2022, 16:30–16:45, S052

Surface spin texture derived from a single mirror plane of WTe₂ — Tristan Heider¹, Gustav Bihlmayer², Jakub Schusser^3,4, Friedrich Reinert⁴, Jan Minar³, Stefan Blügel², Claus M. Schneider¹, and •Lukasz Plucinski¹ — ¹PGI-6 Forschungszentrum Jülich — ²PGI-1 Forschungszentrum Jülich — ³University of West Bohemia, Pilsen, Czech Republic — ⁴Experimentelle Physik VII, Universität Würzburg

WTe₂ is an important semi-metallic quantum material that exhibits non-saturating magnetoresistance and potentially hosts Weyl type-II nodes [1]. Through the laser-driven spin-polarized ARPES Fermi surface mapping, we demonstrate highly asymmetric spin textures of electrons photoemitted from the surface states of WTe₂. Such asymmetries are not present in the initial state spin textures, which are bound by the time-reversal and crystal lattice mirror plane symmetries. The findings are reproduced qualitatively by theoretical modeling within the one-step model photoemission formalism, while a simple toy-model suggests that a similar effect shall be observed in other materials with low symmetry.

Our spin-polarized maps with detail comparable to the previous spin-integrated maps [2] have been measured using the newly developed high-resolution instrument at PGI-6 in Jülich that is based on a hemispherical analyzer with the scanning lens, an exchange-scattering spin detector, and a cw 6 eV laser.

[1] P. K. Das et. al. Electron. Struct. 1, 014003 (2019) and refs. therein. [2] F. Y. Bruno et al., Phys. Rev. B 94, 121112 (2016).