卤素单层中轨道工程的px,y- Kagome晶格
Orbital-engineered px,y-kagome lattice in a halogen monolayer
- Beijing Institute of Technology（北京理工大学）
- Chinese Academy of Sciences（中国科学院）
- University of Chinese Academy of Sciences（中国科学院大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过Br/Ag(111)实现px,y轨道Kagome晶格，利用轨道过滤和H钝化模型揭示其拓扑特性，拓展了Kagome物理至轨道工程领域。
AI中文摘要：
具有明确轨道自由度的多轨道Kagome晶格在很大程度上仍未被探索，因为大多数实验实现的系统依赖于被各向同性单轨道模型近似的复杂d电子流形。在这里，我们通过在Ag(111)上沉积Br单层实现了px,y轨道Kagome晶格，从而克服了这一限制，其中轨道过滤选择性地抑制了pz通道。扫描隧道显微镜、角分辨光电子能谱和密度泛函理论计算揭示了一个大面积、高度有序的Kagome结构，其能带色散与各向异性px,y紧束缚模型定量匹配。为了从衬底背景中提取内在流形，我们构建了一个有效的H钝化模型，该模型揭示了px,y Kagome流形的内在电子结构，并揭示了由一阶自旋轨道耦合效应驱动的非平凡拓扑特性。我们的工作确立了Br/Ag(111)作为多轨道Kagome物理的实验可访问平台，将Kagome范式从传统的d轨道领域扩展到轨道工程的拓扑环境。
英文摘要：
Multi-orbital kagome lattices with explicit orbital degrees of freedom remain largely unexplored, as most experimentally realized systems rely on complex d-electron manifolds that are approximated by isotropic single-orbital models. Here, we overcome this limitation by realizing a px,y-orbital kagome lattice through deposition of a Br monolayer on Ag(111), where orbital filtering selectively suppresses the pz channel. Scanning tunneling microscopy, angle-resolved photoemission spectroscopy, and density-functional-theory calculations reveal a large-area, highly ordered kagome structure whose band dispersions quantitatively match the anisotropic px,y tight-binding model. To extract the intrinsic manifold from the substrate background, we construct an effective H-passivated model, which uncover the intrinsic electronic structure and reveals nontrivial topological characteristics of the px,y kagome manifold driven by first-order spin-orbit coupling effect. Our work establishes Br/Ag(111) as an experimentally accessible platform for multi-orbital kagome physics, extending the kagome paradigm from the conventional d-orbital regime to an orbitally engineered topological setting.
