twisted bilayer CrI3中莫尔磁混沌的涌现
Emergence of moiré magnetic chaos in twisted bilayer CrI3
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中文总结 AI 辅助
该研究在无外场驱动的 twisted bilayer CrI3 中，发现了与介观磁畴变量相关的莫尔磁混沌，通过微磁模拟证实其对初始扰动高度敏感且磁畴构型随机，将非线性磁学扩展至无驱动微观混沌领域。
中文摘要 AI 辅助
传统上，磁混沌的研究聚焦于外场驱动下的宏观变量。本文在无外场驱动的 twisted bilayer CrI3 中，展示了一种新型磁混沌，称为莫尔磁混沌，它与介观磁畴变量相关。这些磁畴由特征层间交换阻挫稳定，该阻挫为自主混沌提供了所需的多个动力学自由度。通过微磁模拟，我们发现弛豫至莫尔磁结构的过程对初始状态的微小局部扰动极为敏感，其特征是显著的有限时间李雅普诺夫指数，且最终态敏感性在五个数量级的扰动幅度上持续存在。统计分析进一步表明，所得磁畴构型具有随机性且两两不相关。我们的结果在扭曲磁体中确定了一种微观、无驱动的混沌形式，将非线性磁学扩展到了传统驱动 regime 之外。
英文摘要
The study of magnetic chaos has traditionally focused on macroscopic variables under external driving. Here we demonstrate a new type of magnetic chaos, termed moiré magnetic chaos, associated with mesoscopic magnetic domain variables in twisted bilayer CrI3 without external driving. The domains are stabilized by a characteristic interlayer exchange frustration, which supplies the multiple dynamical degrees of freedom required for autonomous chaos. Through micromagnetic simulations, we show that relaxation toward moiré magnetic textures is extremely sensitive to minute local perturbations of the initial state, characterized by substantial finite-time Lyapunov exponents and a final-state sensitivity that persists over five decades of perturbation amplitude. Statistical analysis further reveals that the resulting domain configurations are stochastic and pairwise uncorrelated. Our results identify a form of microscopic, undriven chaos in twisted magnets that extends nonlinear magnetism beyond the conventional driven regime.
