Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 30: 2D Materials V – Magnetic, spintronic, and topological properties (joint session HL/TT)

HL 30.1: Invited Talk

Wednesday, March 11, 2026, 15:00–15:30, POT/0081

Dual proximity engineering of spin-orbit and magnetic effects in graphene heterostructures — •Christoph Kastl — Walter Schottky Institute, School of Natural Sciences, Technical University of Munich — Munich Center for Quantum and Technology (MCQST)

The coexistence of induced spin-orbit coupling (SOC) and magnetic exchange fields is predicted to drive graphene into topological phases, such as the quantum anomalous Hall state. Here, I will discuss the prospect of using monolayer graphene proximitized by WSe2 (SOC) and Cr2Ge2Te6 (magnetic exchange) for such dual proximity control. To determine the type and strength of the induced SOC, I will compare Landau fan analysis, where level anticrossings can serve as direct signatures of spin-orbit splittings, to optoelectronic measurements on graphene/WSe2 heterostructures, where the photogalvanic effect can provide an indirect fingerprint of SOC. Low-temperature magnetotransport measurements of the heterostructures with combined magnetic and SOC proximity reveal a large and gate-tunable anomalous Hall effect persisting at zero magnetic field, signaling an intrinsic Berry curvature arising from the interplay of SOC and magnetism. These results highlight the coexistence of spin-orbit and magnetic proximity effects in graphene-based van der Waals heterostructures and establish a route toward topological graphene phases.

Keywords: spin-orbit coupling; magnetism; anomalous Hall; graphene; 2D materials