莫尔拓扑在具有非共线自旋轨道耦合的扭转结构中的应用
Moiré Topology in Twisted Structures with Noncollinear Spin-Orbit Coupling
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中文总结 AI 辅助
提出基于非共线自旋轨道耦合实现拓扑莫尔微带的新途径，在HgI2中验证机制，并通过机器学习代理优化为PbI2，获得更窄更隔离的拓扑平带，支持关联磁性及量子自旋霍尔和陈绝缘体相。
中文摘要 AI 辅助
莫尔超晶格为平带和关联拓扑相提供了一个强大的平台，然而大多数已确立的例子依赖于六角晶格中的谷对比贝里曲率。在此，我们提出一种不同的途径，基于中心对称II型SOC双层中的非共线自旋轨道耦合来实现拓扑莫尔微带。层间杂化打开局域赝隙并产生尖锐局域的贝里曲率，扭转将其重构为孤立的拓扑微带，无需谷自由度或六角对称性。我们在四方Dresselhaus-SOC HgI2中演示了这一机制，其中类Lieb莫尔势产生拓扑平带。为改善微带隔离，我们开发了一种物理信息机器学习代理，识别更强的SOC作为关键设计原则，并指导用Pb替换Hg。所得的PbI2微带更窄且隔离更好，支持关联驱动的磁性和可调量子自旋霍尔及陈绝缘体相，从而为实验探索提供了优化的材料实现。
英文摘要
Moiré superlattices provide a powerful platform for flat bands and correlated topological phases, yet most established examples rely on valley-contrasting Berry curvature in hexagonal lattices. Here, we propose a different route to achieve topological moiré minibands based on noncollinear spin orbit coupling in centrosymmetric type II SOC bilayers. Interlayer hybridization opens local pseudogaps and produces sharply localized Berry curvature, which twisting reconstructs into isolated topological minibands without requiring valley degrees of freedom or hexagonal symmetry. We demonstrate this mechanism in tetragonal Dresselhaus-SOC HgI2, where a Lieb-like moiré potential yields topological flat bands. To improve miniband isolation, we develop a physics-informed machine-learning surrogate that identifies stronger SOC as a key design principle and guides the replacement of Hg by Pb. The resulting PbI2 minibands are narrower and better isolated, supporting correlation-driven magnetism and tunable quantum spin Hall and Chern insulating phases, thereby providing an optimized material realization for experimental exploration.
发表机构
- Washington University in St. Louis（华盛顿大学圣路易斯分校）
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