Probing topological phases in a perturbed Kane-Mele model via RKKY interaction: Application to monolayer jacutingaite PtHgSe
arXiv:2410.10764 · doi:10.1103/PhysRevB.111.014440
Abstract
Quantum spin Hall insulators (QSHIs) are promising for spintronics, leveraging strong spin-orbit coupling for efficient spin manipulation via electrical and optical methods, with potential applications in memory storage, quantum computing, and spin-based logic. While the Kane-Mele model effectively captures the low-energy physics of these materials, the impact of perturbations driving phase transitions is less well understood. Developing approaches to describe these phases is crucial. Here, we study the noncollinear Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between two magnetic impurities in a \textit{perturbed} Kane-Mele model with strong spin-orbit coupling, relevant to monolayer jacutingaite PtHgSe as a prominent QSHI. By analyzing RKKY interactions, we reveal distinct, relative (rather than absolute) signatures of the different phase transitions induced by static and dynamic perturbations based on their impact on magnetic impurities. We then employ these perturbations to switch between ferromagnetic and antiferromagnetic or clockwise and counterclockwise magnetic interactions for control processes. Our results offer a practical way to track topological phases via magnetic properties.
arXiv comment15 pages, 6 figures
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