Electronic Fingerprints of 3Q Magnetism in a Tunable Quantum Material

Scientific Achievement

• Researchers in the Quantum Materials program determined that ARPES directly reveals electronic fingerprints of 3Q magnetic order in Co_xTaS₂, including an inverse Mexican – hat dispersion and van Hove singularities near the Fermi level

Significance and Impact

• This work shows that hidden magnetic textures can be detected directly through their electronic structure, linking magnetism, topology and van Hove singularities in a tunable van der Waals material. It opens a path to engineering topological magnetic phases with controllable electronic properties

Research Details

• Doping dependent ARPES and theory track how Co intercalation tunes flat Co-derived bands and drives the transition from 3Q to helical magnetic order

Publication Details

Luo, J. Rodriguez, D. Dutta, M. Huber, H. Jiang, L. Moreschini, Xu, C. Jozwiak, A. Fedorov, C. Jozwiak, A. Bostwick, G. Chang, G. Analytis, D.H. Lee and A. Lanzara, Nature Communication (2026).

DOI:10.1038/s41467-026-70063-5

Work was performed at Lawrence Berkeley National Lab and in part at the Advanced Light Source.