RKKY interactions mediated by topological states in transition metal doped bismuthene
arXiv:2210.14658 · doi:10.1063/5.0140027
Abstract
We have investigated magnetic interactions between transition metal ions in bismuthene topological insulator with protected edge states. We find that these topological states have a crucial role on the magnetic interactions in 2D topological insulators. Using first-principles and model Hamiltonian we make a comparative study of transition metal doped bulk and nanoribbon bismuthene. While direct overlap between the transition metal prevails in gapped bulk bismuthene, at the borders of nanoribbons a long-range magnetism is present. The exchange interactions are well described by a RKKY-like Hamiltonian mediated by topological states. Our results show a dominance of antiferromagnetism promoted by the topological states, preserving the spin-locked Dirac crossing states due to a global time-reversal symmetry preservation. This extended magnetic interactions mediated by massless electrons can increase the spin diffusion length being promising for fast dissipationless spintronic devices.
arXiv comment6 pages, 4 figures
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