Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 7: Poster Magnetism I

MA 7.60: Poster

Montag, 9. März 2026, 09:30–12:30, P2

Chirality dependent orbital magnetism and anomalous transport in twisted antiferromagnetic bilayers — •Zhiyuan He — Weinberg 2, 06120 Halle (Saale), Germany

Twisted magnetic van der Waals heterostructures have emerged as a fertile ground for exploring the interplay between lattice geometry and magnetism. While the twist angle magnitude governs the moiré potential scale, the physical consequences of the twist angle sign (chirality) remain unexplored due to the inherent mirror symmetry in conventional bilayer systems. In largely this work, we theoretically investigate the electronic structure and orbital transport properties of twisted A-type antiferromagnetic bilayers using a tight-binding model that incorporates lattice anisotropy and interface-induced symmetry breaking. We researched that the interference between the rotating lattice anisotropy and a fixed symmetry-breaking field lifts texture the degeneracy between positive (+θ) and negative (−θ) twist configurations. This symmetry breaking manifests significantly in the momentum-space distribution of the Orbital Magnetic Moment (OMM). on the twist chirality, leading to non-reciprocal Berry curvature distributions. These findings suggest that the twist sign can serve as a switchable degree of freedom to manipulate orbital-driven transport phenomena, such as the topological Hall effect and magneto-optical responses, in altermagnetic moiré systems.

Keywords: Chirality; Two-dimensional materials; Altermagnets; Twisted; Orbital angular momentum