Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 39: 2D semiconductors VII – CrSBr and related heterostructures
HL 39.11: Talk
Thursday, March 12, 2026, 12:15–12:30, POT/0081
Tunable exchange interaction and hysteresis observed via excitons in a van der Waals antiferromagnet bilayer — •Priyanka Mondal1, Sonu Verma2, Wenze Lan1, Lukas Krelle1, Ryan Tan1, Regine von Klitzing1, Kseniia Mosina3, Zdenek Sofer3, Akashdeep Kamra2, and Bernhard Urbaszek1 — 1Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 6-8, D-64289 Darmstadt, Germany — 2Department of Physics and Research Center OPTIMAS, Rheinland-Pf\"alzische Technische Universit\"at Kaiserslautern-Landau,Germany — 3Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Czech Republic
Two-dimensional magnets have emerged as key platforms for exploring layer-dependent magnetic phenomena. CrSBr is a recently identified van der Waals magnet with strong excitonic features and layered antiferromagnetic (AFM) order. While pristine bilayers show no magnetic hysteresis, we find that a ~3° twist induces clear hysteresis and can even stabilize a zero-field ferromagnetic state[1]. Field-dependent photoluminescence tracks this behavior through hysteretic exciton energy shifts that match the magnetic configuration. A two-sublattice model explains the response via twist-reduced interlayer exchange, allowing both parallel and antiparallel spin states. The bilayer behaves as an effective monodomain, switching cleanly into the AFM state without forming spin textures. These results highlight twist engineering as a route to programmable magnetic memory in 2D magnets.
[1] P. Mondal et al. arXiv preprint arXiv:2510.08018 (2025).
Keywords: 2D material; Photoluminscence; Magnetism; CrSBr; Twisted