大扭转角莫尔超晶格中的分层弛豫驱动超莫尔的形成
Hierarchical Relaxation in Large-twist-angle Moire Drives Supermoire Formation
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中文总结 AI 辅助
本研究揭示大扭转角双层中超莫尔形成的微观机制为分层晶格弛豫，通过力场模拟与电子叠层成像实验，发现皮米级Se-Se排斥力驱动短程莫尔弛豫与长程超莫尔调制耦合，明确该尺度弛豫对研究大角度莫尔体系量子现象的必要性。
中文摘要 AI 辅助
近期研究表明，大扭转角双层结构中的超莫尔晶格由公度堆垛 motif 的周期性排列产生，但其形成的微观结构机制仍未明确。本研究揭示超莫尔有序的微观起源为分层晶格弛豫过程，通过力场模拟结合超分辨、层分辨多切片电子叠层成像的实验验证，发现皮米级的层间Se-Se排斥力是驱动源，引发约1 nm的短程莫尔弛豫与约10 nm的长程超莫尔调制耦合共存。这些结果表明，皮米级晶格弛豫在大角度莫尔体系中仍起关键作用，需明确纳入对其涌现电子与量子现象的研究中。
英文摘要
Supermoire lattices in large-angle twisted bilayers have recently been shown to emerge from periodic arrangements of commensurate stacking motifs, yet the microscopic structural mechanism governing their formation has remained unresolved. Here, we uncover the microscopic origin of supermoire order as a hierarchical lattice relaxation process. Combining force-field simulations with experimental validation via super-resolution, layer-resolved multislice electron ptychography, our results identify interlayer Se-Se repulsion at the picometer scale as the driving force, giving rise to coupled short-range (about 1 nm) moire relaxation and coexisting long-range (about 10 nm) supermoire modulation. These findings demonstrate that even picometer-scale lattice relaxation remains critical in large-angle moire systems and must be explicitly considered in understanding their emergent electronic and quantum phenomena.
发表机构
- Rice University（莱斯大学）
- The University of Texas at Austin（德克萨斯大学奥斯汀分校）
- Argonne National Laboratory（阿贡国家实验室）
机构由 AI 辅助整理，请以论文原文为准。
