Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Altermagnets II
MA 8.7: Vortrag
Montag, 9. März 2026, 16:30–16:45, HSZ/0002
Ferroelectricity-driven altermagnetism in two-dimensional van der Waals multiferroics — •Bo Zhao1, Fu Li1, Wei Ren2, Hao Wang1, and Hongbin Zhang1 — 1Theory of Magnetic Materials, Institute of Materials Science, Technical University of Darmstadt, 64287 Darmstadt, Germany — 2Institute for Quantum Science and Technology, State Key Laboratory of Advanced Refractories, Materials Genome Institute, Physics Department, Shanghai University, Shanghai 200444, China
Altermagnets (AMs) are an unconventional class of collinear compensated antiferromagnets that exhibit momentum-dependent spin splitting despite zero net magnetization. Using spin space group (SSG) symmetry analysis and first-principles calculations, we show that altermagnetism in two-dimensional multiferroics can be efficiently controlled by ferroelectric polarization and interlayer sliding. As a material platform, monolayer and bilayer FeCuP2S6 display finite spin splitting when ferroelectric sublattices are linked by nonsymmorphic screw-axis operations instead of pure translation or inversion. Interlayer sliding allows reversible switching or suppression of this spin splitting through SSG modifications. We further find that the anomalous Hall response directly probes these spin-split states. These results highlight 2D van der Waals multiferroics as promising systems for electrically tunable altermagnetism and next-generation spintronic applications.
[1] B. Zhao et al. arXiv:2511.00712.
Keywords: Two-dimensional ferroelectrics; Van der Waals materials; Spin Space Group (SSG) Symmetry; Spintronics