发表机构
Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Neutron Science and Technology, School of Physics, Sun Yat-Sen University（中山大学物理学院中子科学与技术研究所光电材料与技术国家重点实验室磁电物理与器件广东省重点实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过第一性原理计算和自旋波理论，揭示双层CrI$_3$中堆叠几何可调控交变磁序及拓扑磁振子能带，并量化磁振子相互作用效应，为堆叠工程调控自旋电子学器件提供新途径。
AI 中文摘要
堆叠的范德华磁体为交变磁性（一种以动量依赖的自旋劈裂为特征的补偿磁序）以及这种磁序所能承载的拓扑磁激发提供了一条可调控的路径。在双层CrI$_3$中，第一性原理计算和线性自旋波理论揭示了由堆叠控制的交变磁序及其相关的磁振子能带拓扑。结合带表示分析与针对非弹性中子散射的动态结构因子计算，我们进一步表征了手性劈裂的拓扑磁振子，并使用多体格林函数方法量化了它们的能量修正和寿命。层间磁性基态对堆叠几何高度敏感，从而控制了磁振子能带拓扑和输运响应。我们还表明，磁振子-磁振子相互作用会重整化磁振子色散和动态结构因子，其中特别关注磁振子衰变。以范德华双层CrI$_3$作为代表性平台，我们的结果确立了堆叠工程作为调控交变磁性及相关拓扑磁振子激发的结构途径，为堆叠控制的自旋电子学和磁振子学器件开辟了道路。
英文摘要
Stacked van der Waals magnets provide a tunable route to altermagnetism, a compensated magnetic order characterized by momentum-dependent spin splitting, and to the topological magnetic excitations that such order can host. In bilayer CrI$_3$, first-principles calculations and linear spin-wave theory reveal stacking-controlled altermagnetic order and associated magnon band topology. Combining band-representation analysis with calculations of the dynamic structure factor relevant to inelastic neutron scattering, we further characterize the chirally split topological magnons and quantify their energy corrections and lifetimes using a many-body Green's-function approach. The interlayer magnetic ground state is highly sensitive to the stacking geometry, thereby controlling the magnon band topology and transport responses. We further show that magnon--magnon interactions renormalize the magnon dispersion and dynamic structure factor, with a particular focus on magnon decay. Using van der Waals bilayer CrI$_3$ as a representative platform, our results establish stacking engineering as a structural route for tuning altermagnetism and associated topological magnon excitations, opening avenues toward stacking-controlled spintronic and magnonic devices.
Comments17 pages, 4 figures
