Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Surface Magnetism
O 64.9: Vortrag
Mittwoch, 11. März 2026, 17:30–17:45, HSZ/0403
Triple-Q state in magnetic breathing kagome lattice — Hangyu Zhou1,2, Manuel dos Santos Dias3, Weisheng Zhao1, and •Samir Lounis4,2 — 1Fert Beijing Institute, Beihang University, Beijing, China — 2Peter Grünberg Institut, Forschungszentrum Jülich & JARA, Jülich, Germany — 3Scienti c Computing Department, STFC Daresbury Laboratory, Warrington, United Kingdom — 4Institute of Physics, Martin-Luther-University Halle-Wittenberg, Halle, Germany
Magnetic frustration in two-dimensional triangular spin lattices produces a variety of exotic states, from multi-Q configurations to disordered spin glasses. The antiferromagnetic kagome lattice, built from corner-sharing triangles, is a paradigmatic frustrated system with macroscopic degeneracy. Building on the kagomerization mechanism we recently introduced [1], we examine the magnetic breathing kagome lattice formed by an Mn monolayer on a heavy-metal substrate capped with h-BN [2]. The Mn kagome geometry induces strong frustration, reflected in the nearly flat bands obtained from spin-spiral energy calculations. Including further-neighbor interactions yields a spin-spiral energy minimum along Γ-K and a triple-Q state with nonzero topological charge, potentially causing highly nonlinear Hall responses. The flat-band character can also stabilize more complex spin textures featuring multiple Q-pockets in the spin structure factor. These findings provide a fertile platform for studying multi-Q states and emergent topological phenomena. [1] Zhou et al., Nature Communications 15, 4854 (2025); [2] Zhou et al., npj Spintronics 3, 31 (2025)
Keywords: Kagome; 2D materials; complex magnetism and magnetic frustration; density functional theory