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TT: Fachverband Tiefe Temperaturen

TT 59: 2D Materials V – Magnetic, spintronic, and topological properties (joint session HL/TT)

TT 59.2: Vortrag

Mittwoch, 11. März 2026, 15:30–15:45, POT/0081

Twist angle and pressure tuning of proximity-induced spin-orbit coupling in graphene/WSe₂ heterostructures — Tobias Rockinger¹, Bálint Szentpéteri², Szabolcs Csonka², Marina Marocko¹, Julia Amann¹, Ziyang Gan³, Antony George³, Andrey Turchanin³, Kenji Watanabe⁴, Takashi Taniguchi⁴, Dieter Weiss¹, Péter Makk², and •Jonathan Eroms¹ — ¹Department of Physics, University of Regensburg, Regensburg, Germany — ²Department of Physics, Budapest University of Technology and Economics, Budapest, Hungary — ³Institute of Physical Chemistry, Friedrich Schiller University Jena, Jena, Germany — ⁴National Institute for Materials Science, Tsukuba, Japan

Proximity-induced spin-orbit interaction in heterostructures of graphene and transition metal dichalcogenides has been studied intensely in the past few years. However, present experiments still suffer from poor reproducibility, as one key parameter, the twist angle between the crystal axes of both materials, has not been systematically controlled during fabrication. Band structure calculations, on the other hand, have predicted a decisive influence of this parameter. In our experiments, we control the twist angle during fabrication by aligning fractured or CVD grown edges and resolving the ambiguity of zigzag and armchair directions using a crystallographic etching process. We employ weak antilocalization to extract the spin-orbit coupling parameters quantitatively, and report excellent reproducibility and a good match to theoretical predictions. We also confirm the influence of high pressure on the proximity effect.

Keywords: Graphene; Proximity effect; spin-orbit coupling; WSe2