Ho–Pb Monolayers With Kagome and Striped Structures

Scaling the electronic and magnetic phases to the monolayer limit is able to produce a rich and complex landscape of emergent effects, highly promising for applications in ultracompact spintronic devices. Here, we report on the epitaxial synthesis of a two‐dimensional Pb‐based kagome monolayer and suggest a strategy to engineer the periodic structure with alternating and Pb stripes. Both phases demonstrate a Rashba‐like spin polarization and several Van Hove singularities in the band structure, including high‐order ones, which potentially may enable the strong electronic correlations. The DFT calculations have predicted that both 2D and quasi‐1D phases exhibit an unusual combination of in‐plane noncollinear antiferromagnetic alignment of Ho magnetic moments, along with small out‐of‐plane spin polarization, which makes them ferrimagnets. Furthermore, the striped phase was found to hold the fingerprints of the 1D Tomonaga–Luttinger liquid. Our results offer a versatile approach to control the anisotropy of low‐dimensional materials, facilitating the development of tunable spintronic devices.