SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Poster Session V: Electronic structure of surfaces: Spectroscopy, surface states III

O 64.2: Poster

Mittwoch, 3. März 2021, 10:30–12:30, P

Spin and Orbital Angular Momentum observed by Linear Dichroism: Interplay of Inversion Symmetry Breaking and Spin-Orbit Coupling — •Maximilian Ünzelmann¹, Hendrik Bentmann¹, Tim Figgemeier¹, Raphael Crespo Vidal¹, Thiago R. F. Peixoto¹, Henriette Maaß¹, Chul-Hee Min², and Friedrich Reinert¹ — ¹Experimentelle Physik 7, Universität Würzburg — ²Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel

The formation of spin- and orbital angular momentum (SAM and OAM) for electronic states in non-centrosymmetric crystal-structure environments is shaped by a complex interplay of inversion symmetry breaking (ISB) and spin-orbit coupling (SOC) as well as their characteristic energy scales [1]. This phenomenology plays an important role in many modern quantum materials, such as topological insulators and Weyl semimetals [2,3]. Devising experimental approaches to access SAM and OAM is thus of fundamental interest. By means of spin- and angle-resolved photoemission we have investigated the photoelectron spin polarization and the linear dichroism (LD) [4] in various materials with spin-polarized surface states. Our results suggest that LD is linked to the OAM [5] in regimes dominated by either SOC or ISB.

[1] V. Sunko et al., Nature 549, 492 (2017)

[2] M. Schüler et al., Sci. Adv. 6, eaay2730 (2020)

[3] M. Ünzelmann et al., arXiv:2012.06996 (2020)

[4] H. Bentmann et al., Phys. Rev. Lett. 119, 106401 (2017)

[5] M. Ünzelmann et al., Phys. Rev. Lett. 124, 176401 (2020)