Work

Observation of gapped Dirac magnons in a Co bilayer grown on Ru(0001)

Year: 2026

Type: article

Abstract: Beyond their fundamental interest in exploring bosonic Dirac physics, Dirac magnons hold potential for the development of efficient spin-transport devices. Here, we demonstrate the experimental realization of gapped terahertz Dirac magnons in an epitaxial Co bilayer on Ru(0001) using spin-polarized electron spectroscopy. Supported by first-principles calculations, we show that although the substrate breaks sublattice symmetry, thereby opening a gap at the K ¯ points, the local valley topology is preserved. This is evidenced by a spectral weight redistribution, valley-centered curvature concentrations, and a nonzero local Berry phase. Our results establish the interface as a tuning parameter, paving the way for engineering Dirac magnons in a variety of simple ultrathin bilayer magnets.

Source: Physical review. B./Physical review. B

DOI: 10.1103/cprf-rwsn

Authors: Khalil Zakeri, Arthur Ernst, Christopher Hins

Institutions: Karlsruhe Institute of Technology, Johannes Kepler University of Linz, Max Planck Institute of Microstructure Physics, Donostia International Physics Center

Language: English

Topic: Magnetic properties of thin films

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Deutsche Forschungsgemeinschaft, Austrian Science Fund

Awards: G1597271289, G315818614, Spin structures in pure and rare earth doped thin ferrites