发表机构
National Central University（中央大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究基于石墨烯纳米结构的人工量子材料中界面态微观起源，通过调节耦合揭示节点轨道特性及关系，用实验合成示例解释零能模并定量再现光谱，证明节点轨道可构建可调平带的人工石墨烯纳米带，实现可控量子输运。
AI 中文摘要
基于原子精确的石墨烯纳米结构的人工量子材料为探索由局域电子态产生的量子现象提供了理想平台。本文开发了一个实空间理论框架来阐明由\(n -\)三角烯和扶手椅型石墨烯纳米带（AGNR）组成的石墨烯结构中界面态的微观起源。通过连续调节石墨烯构建块之间的耦合，揭示了三角烯零能模和AGNR终态在三叉结处演化为紧凑的局域节点轨道。这些节点轨道的数量和手性遵循通用关系\(N_{node,\delta}=|N_{es,t,A(B)}-N_{tri,0,B(A)}|\)。利用实验合成的三角烯纳米石墨烯作为示例，在扩展的安德森模型中进一步解释了其零能模的出现并定量再现了隧穿光谱。这些节点轨道可作为构建在费米能附近具有高度可调平带的人工石墨烯纳米带的基本构建块，所得的紧凑局域态表现出可控简并性和强各向异性量子输运。
英文摘要
Artificial quantum materials based on atomically precise graphene nanostructures provide an ideal platform for exploring quantum phenomena arising from localized electronic states. Here, we develop a real-space theoretical framework to elucidate the microscopic origin of interface states in graphene architectures composed of $n$-triangulenes and armchair graphene nanoribbons (AGNRs). By continuously tuning the coupling between graphene building blocks, we reveal the evolution of triangulene zero-energy modes and AGNR end states into compact localized node orbitals at three-arm junctions. For the chiral bipartite junctions considered here, the number and sublattice character of these node orbitals follow a general counting relation, $N_{node,δ}=|N_{es,t,A(B)}-N_{tri,0,B(A)}|$, where $N_{es,t}$ is the total number of AGNR end states contributed by the three AGNR arms and $N_{tri,0}$ is the number of triangulene zero-energy modes. The resulting node-orbital chirality is determined by the dominant constituent: when $N_{es,t}>N_{tri,0}$, they inherit the sublattice chirality of the AGNR end states ($δ=A(B)$), whereas for $N_{tri,0}>N_{es,t}$ they inherit that of the triangulene zero-energy modes ($δ=B(A)$). Using experimentally synthesized triangulene nanographenes as representative examples, we further identify their low-energy zero-mode structure and investigate its manifestation in tunneling transport within an extended Anderson framework. Finally, we demonstrate that these node orbitals can serve as elementary building blocks for constructing artificial graphene nanoribbons with highly tunable flat subbands near the Fermi energy. The resulting compact localized states exhibit controllable degeneracy and strongly anisotropic quantum transport.
Comments21 pages, 19 figures and revised abstract and added a new appendix
