自旋(空气动力学)
反铁磁性
物理
量子
戒指(化学)
凝聚态物理
海森堡模型
自旋工程
磁性
化学
量子自旋液体
周期边界条件
表征(材料科学)
量子力学
激发
扫描隧道显微镜
量子计算机
自旋态
分子物理学
准粒子
量子动力学
平面的
量子数
退化(生物学)
量子系统
量子相
量子态
原子物理学
作者
Can Li,Manish Kumar,Ying Wang,Diego Manuel Soler Polo,Yijun Wang,He Qi,Liang Liu,X. Liu,DanDan Guan,Yaoyi Li,Hao Zheng,Canhua Liu,Jinfeng Jia,Pei Nian Liu,Pavel Jelinek,Deng‐Yuan Li,Shiyong Wang
标识
DOI:10.48550/arxiv.2602.11593
摘要
Quantum spin rings represent fundamental model systems that exhibit distinctive quantum phenomena-such as quantum critical behavior and quasiparticle excitations-arising from their periodic boundary conditions and enhanced quantum fluctuations. Here, we report the on-surface synthesis and atomic-scale characterization of antiferromagnetic S=1/2 quantum spin rings composed of pristine and unmodified [2]triangulene units on a Au(111) surface. Using stepwise on-surface synthesis followed by STM tip-induced dehydrogenation, we precisely constructed cyclic five- and six-membered spin rings and investigated their spin states via scanning probe microscopy and multireference calculations. Nc-AFM imaging reveals that the six-membered ring retains a planar geometry, whereas the five-membered ring exhibits pronounced structural distortion. The six-membered ring hosts a uniform excitation gap that can be accurately described by a Heisenberg spin model and multireference CASCI calculations. In contrast, the distorted five-membered ring displays spin ground states with asymmetric spatial distributions due to degeneracy lifting induced by structural distortion. Our findings establish a versatile molecular platform for exploring correlated magnetism and quantum spin phenomena in cyclic organic magnetic architectures with disorder.
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