Quantum Spin-1/2 Rings Built from [2]Triangulene Molecular Units
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arXiv
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2026
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| _version_ | 1866911442537545728 |
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| author | Li, Can Kumar, Manish Wang, Ying Polo, Diego Manuel Soler Wang, Yi-Jun Qi, He Liu, Liang Liu, Xiaoxue Guan, Dandan Li, Yaoyi Zheng, Hao Liu, Canhua Jia, Jinfeng Liu, Pei-Nian Jelinek, Pavel Li, Deng-Yuan Wang, Shiyong |
| author_facet | Li, Can Kumar, Manish Wang, Ying Polo, Diego Manuel Soler Wang, Yi-Jun Qi, He Liu, Liang Liu, Xiaoxue Guan, Dandan Li, Yaoyi Zheng, Hao Liu, Canhua Jia, Jinfeng Liu, Pei-Nian Jelinek, Pavel Li, Deng-Yuan Wang, Shiyong |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_11593 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantum Spin-1/2 Rings Built from [2]Triangulene Molecular Units Li, Can Kumar, Manish Wang, Ying Polo, Diego Manuel Soler Wang, Yi-Jun Qi, He Liu, Liang Liu, Xiaoxue Guan, Dandan Li, Yaoyi Zheng, Hao Liu, Canhua Jia, Jinfeng Liu, Pei-Nian Jelinek, Pavel Li, Deng-Yuan Wang, Shiyong Materials Science Atomic and Molecular Clusters Chemical Physics 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. |
| title | Quantum Spin-1/2 Rings Built from [2]Triangulene Molecular Units |
| topic | Materials Science Atomic and Molecular Clusters Chemical Physics |
| url | https://arxiv.org/abs/2602.11593 |