发表机构
University of Manchester; National Graphene Institute, University of Manchester; Diamond Light Source; University of Oxford; Henry Royce Institute for Advanced Materials（曼彻斯特大学; 国家石墨烯研究所，曼彻斯特大学; 英国钻石光源; 牛津大学; 亨利·罗伊斯先进材料研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用多切片电子叠层成像术，解析厚过渡金属二硫化物晶体间小角度扭曲菱面体埋入界面的晶格重构，发现外层抑制面外弯曲使面内重构强于三维模型预测，为多层莫尔体系研究提供结构基础。
AI 中文摘要
扭曲二维界面处的原子重构决定了其诸多涌现的光学、电学和力学性质，包括滑动铁电性。尽管近期在悬浮扭曲双层膜的晶格重构研究上取得了进展，但多层晶体间范德华异质界面的结构变化仍在很大程度上未被探索。本研究采用多切片电子叠层成像术，非侵入式地重构厚过渡金属二硫化物晶体间小角度扭曲菱面体界面的三维原子结构，其位置精度约为3皮米，深度分辨率约为1纳米，可解析每层由扭曲诱导的晶格重构场，以及埋入界面处产生的位错网络。尽管该结构具有体相性质，但由于外层抑制了面外弯曲，观测到显著强的面内界面重构，超出了三维模型的预测。此外，本研究提取了重构向体相衰减过程中的应变张量演化，为理解多层莫尔体系提供了结构基础。
英文摘要
Atomic reconstruction at twisted two-dimensional interfaces governs many of their emergent optical, electronic, and mechanical properties, including sliding ferroelectricity. Despite recent progress in understanding lattice reconstruction in suspended twisted bilayers, structural changes at van der Waals heterointerfaces between multilayer crystals remain largely unexplored. Here we use multi-slice electron ptychography to non-invasively recover the three-dimensional atomic structure at marginally twisted rhombohedral interfaces between thick transition-metal dichalcogenide crystals. With a position precision of ~3 pm and a depth resolution ~1 nm, we resolve the twist-induced lattice reconstruction field per layer, and the resulting dislocation network at the buried interface. Despite the bulk nature, we observe markedly strong in-plane interfacial reconstruction due to suppression of the out-of-plane bending by outer layers, exceeding predictions from our three-dimensional modelling. Furthermore, we extract the strain tensor evolution during the decay of the reconstruction into the bulk, providing a structural foundation for understanding multi-layer moiré systems.
