扭曲双层锗烯中的装饰性电子kagome晶格
Decorated electronic kagome lattice in twisted bilayer germanene
- University of Twente（特温特大学）
- Utrecht University（乌得勒支大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过实验与计算证明，在Ge2Pt上相称扭曲的双层锗烯可形成两种电子性质不同的大角度莫尔相，其中偶宇称相呈现具有C3对称性的装饰性kagome电子态，为二维褶皱材料中工程化类kagome电子态提供了平台。
AI中文摘要：
人工kagome晶格为电子平带、几何阻挫和关联驱动相提供了途径，但它们在原子级控制的二维材料中的实现仍然稀少。在此，我们展示了在Ge2Pt上相称扭曲的双层锗烯产生两种电子性质不同的大角度莫尔相。扫描隧道显微镜测量和密度泛函理论计算揭示，在亚晶格交换下为奇数的相称扭曲双层是半导体性的，而具有偶宇称的扭曲双层是金属性的。具有偶宇称的扭曲双层承载一个空态共振，该共振表现出具有C3对称性的新兴装饰性kagome结构。这些结果确立了作为在褶皱二维材料中工程化类kagome电子态平台的大角度扭曲锗烯。
英文摘要：
Artificial kagome lattices provide a route to electronic flat bands, geometric frustration, and correlation driven phases, but their realization in atomically controlled two-dimensional materials remains scarce. Here, we show that commensurate twisted bilayer germanene on Ge2Pt produces two electronically distinct large-angle moiré phases. Scanning tunneling microscopy measurements and density functional theory calculations reveal that commensurate twisted bilayers that are odd under an exchange of sublattices are semiconducting, whereas the twisted bilayers with an even parity are metallic. The twisted bilayers with an even parity host an empty state resonance that exhibits an emergent decorated kagome structure with a C3 symmetry. These results establish large-angle twisted germanene as a platform for engineering kagome-like electronic states in a buckled two-dimensional material.
