菱面石墨烯超晶格中的平带空间重正化可视化
Visualizing flat-band spatial renormalization in rhombohedral graphene superlattices
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中文总结 AI 辅助
本研究通过扫描隧道显微镜可视化菱面石墨烯超晶格的平带空间重正化，明确了莫尔周期势与新奇拓扑序的关键联系。
中文摘要 AI 辅助
菱面石墨烯/hBN莫尔超晶格展现出由平带驱动的新奇相，包括超导性和分数量子反常霍尔效应（FQAHE），但莫尔势的微观作用仍不清楚。本研究利用扫描隧道显微镜，可视化菱面五层和四层石墨烯/hBN超晶格中平带的莫尔调制空间重正化。观测到空间分层填充，表现为平带在莫尔尺度上的周期性能量位移，导致相互作用区域中关联态的空间重构。值得注意的是，该调制在莫尔周期低于约10 nm时消失，而FQAHE也在相同阈值以下不存在。理论建模将该机制归因于原子波纹诱导的电荷重新分布。本研究提供了莫尔工程平带重构的实空间可视化，明确了莫尔周期势与新奇拓扑序之间的关键联系。
英文摘要
Rhombohedral graphene/hBN moiré superlattices exhibit flat-band-driven emergent phases, including superconductivity and the fractional quantum anomalous Hall effect (FQAHE), yet the microscopic role of the moiré potential remains unclear. Here, using scanning tunneling microscopy, we visualize moiré-modulated spatial renormalization of flat bands in rhombohedral pentalayer and tetralayer graphene/hBN superlattices. We observe spatially hierarchical filling, manifested as periodic energy shifts of the flat bands at the moiré scale, leading to spatial reshaping of correlated states in the interacting regime. Remarkably, this modulation vanishes below a ~10 nm moiré period--the same threshold below which the FQAHE is absent. Theoretical modeling attributes this mechanism to atomic-corrugation-induced charge redistribution. Our work provides real-space visualization of moiré-engineered flat-band reconstruction, resolving a key link between moiré periodic potential and emergent topological order.
