Year: 2025
Type: article
Abstract: The recently discovered van der Waals material CeSiI exhibits both heavy fermion behavior and spiral order with strong magnetic anisotropy which makes it a potential host for topological spin textures such as skyrmions through electrical gating. A monolayer of CeSiI consists of two layers of Ce atoms on triangular lattices that sandwich a silicene layer. Motivated by the experiments, we explore the magnetic phase diagram in van der Waals heavy fermion materials as a function of anisotropy and applied magnetic field using an effective spin model. We demonstrate that the application of an external electric field can tune the Kondo coupling on each Ce layer differently, in turn allowing for controlling the intra- and interlayer magnetic couplings. Our analysis indicates that this fine tuning leads to the coexistence of different magnetic orders in a single monolayer. In particular, we show that a vortex phase can be stabilized only in the presence of an external electric field. Our results highlight the unique advantages and the tunability of van der Waals heavy fermion materials for the manipulation of chiral magnetic phases.
Authors: Aayush Vijayvargia, Hao Zhang, Kipton Barros, Shi-Zeng Lin, Onur Erten
Institutions: Arizona State University, Los Alamos National Laboratory
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4408126464