海森堡自旋-1/2反铁磁分子链
Heisenberg Spin-1/2 Antiferromagnetic Molecular Chains
AI总结：
本文研究以二氮杂六苯并蔻为重复单元的反铁磁纳米石墨烯链，结合扫描隧道显微镜、密度泛函理论和量子自旋模型，发现其奇偶链分别呈现Kondo激发和带隙激发，并实现了纠缠量子海森堡模型，为拓扑自旋晶格提供了实验平台。
摘要：
具有π电子磁性的碳基纳米结构因其在纳米自旋电子学中的巨大潜力而引起了极大的关注。特别是，通过表面反应合成的具有磁性分子单元的量子链，为研究局域自旋分量之间的磁交换相互作用提供了理想的平台。在此，我们对以二氮杂六苯并蔻分子为重复单元的反铁磁纳米石墨烯链进行了广泛研究。结合键分辨扫描隧道显微镜、密度泛函理论和量子自旋模型，揭示了它们的详细结构以及电子和磁学性质。我们发现，反铁磁链在重复单元数为偶数时承载一种具有带隙激发的集体态，而在重复单元数为奇数时承载一种具有Kondo激发的集体态。与精确的多体量子自旋模型相比，我们的分子链实现了纠缠量子海森堡模型。结合分子构建单元的可调性，这些体系可以作为实验实现拓扑自旋晶格的理想平台。
英文摘要：
Carbon-based nanostructures possessing π-electron magnetism have attracted tremendous interest due to their great potential for nano spintronics. In particular, quantum chains with magnetic molecular units synthesized by on-surface reactions provide an ideal playground for investigating magnetic exchange interactions between localized spin components. Here, we present an extensive study of antiferromagnetic nanographene chains with the diazahexabenzocoronene molecule as the repeating unit. A combination of bond-resolved scanning tunneling microscopy, density functional theory and quantum spin models revealed their detailed structures and electronic and magnetic properties. We found that the antiferromagnetic chains host a collective state featuring gapped excitations for an even number of repeating units and one featuring a Kondo excitation for an odd number. Comparing with exact many-body quantum spin models, our molecular chains provide the realization of an entangled quantum Heisenberg model. Coupled with the tunability of the molecular building blocks, these systems can act as an ideal platform for the experimental realization of topological spin lattices.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
