Construction of Kondo Chains by Engineering Porphyrin π-Radicals on Au(111)
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| Autores principales: | , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908590493663232 |
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| author | Zhao, Yan Jiang, Kaiyue Liu, Peng-Yi Li, Jie Li, Ruoning Li, Xin Fang, Xinchen Zhao, Anjing Zhu, Yutong Xu, Hongxiang Chen, Ting Wang, Dong Zhuang, Xiaodong Hou, Shimin Wu, Kai Gao, Song Sun, Qing-Feng Zhang, Yajie Wang, Yongfeng |
| author_facet | Zhao, Yan Jiang, Kaiyue Liu, Peng-Yi Li, Jie Li, Ruoning Li, Xin Fang, Xinchen Zhao, Anjing Zhu, Yutong Xu, Hongxiang Chen, Ting Wang, Dong Zhuang, Xiaodong Hou, Shimin Wu, Kai Gao, Song Sun, Qing-Feng Zhang, Yajie Wang, Yongfeng |
| contents | Quantum manipulation of molecular radical spins provides a crucial platform for exploring emergent phenomena in many-body systems. Here, we combine surface-confined synthesis with scanning tunneling microscopy(STM)tip-induced dehydrogenation to achieve atom-precise engineering of quasi-one-dimensional porphyrin-based Kondo chains (1-7 units) on Au(111). High-resolution STS measurements and low-energy effective modeling collectively demonstrate that π-radicals at each fused-porphyrin unit form Kondo singlets screened by conduction electrons. Adjacent singlets develop direct coherent coupling via quantum-state-overlap-enabled electron tunneling. Crucially, chiral symmetry in the effective model governs zero-mode distribution-present in odd-length chains yet absent in even-length chains-which dictates pronounced odd-even quantum effects in STS spectra of finite chains. Furthermore, the number of parallel porphyrin chains non-monotonically tunes the competition between the Kondo effect and spin exchange, showing opposing trends in strength and demonstrating that both wave-function overlap and the SOMO-LUMO gap collectively govern these interactions. This work simultaneously resolves the dimensional dependence of many-body correlations in confined quantum systems and pioneers approaches for quantum-critical manipulation in molecular spin architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_10729 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Construction of Kondo Chains by Engineering Porphyrin π-Radicals on Au(111) Zhao, Yan Jiang, Kaiyue Liu, Peng-Yi Li, Jie Li, Ruoning Li, Xin Fang, Xinchen Zhao, Anjing Zhu, Yutong Xu, Hongxiang Chen, Ting Wang, Dong Zhuang, Xiaodong Hou, Shimin Wu, Kai Gao, Song Sun, Qing-Feng Zhang, Yajie Wang, Yongfeng Mesoscale and Nanoscale Physics Quantum manipulation of molecular radical spins provides a crucial platform for exploring emergent phenomena in many-body systems. Here, we combine surface-confined synthesis with scanning tunneling microscopy(STM)tip-induced dehydrogenation to achieve atom-precise engineering of quasi-one-dimensional porphyrin-based Kondo chains (1-7 units) on Au(111). High-resolution STS measurements and low-energy effective modeling collectively demonstrate that π-radicals at each fused-porphyrin unit form Kondo singlets screened by conduction electrons. Adjacent singlets develop direct coherent coupling via quantum-state-overlap-enabled electron tunneling. Crucially, chiral symmetry in the effective model governs zero-mode distribution-present in odd-length chains yet absent in even-length chains-which dictates pronounced odd-even quantum effects in STS spectra of finite chains. Furthermore, the number of parallel porphyrin chains non-monotonically tunes the competition between the Kondo effect and spin exchange, showing opposing trends in strength and demonstrating that both wave-function overlap and the SOMO-LUMO gap collectively govern these interactions. This work simultaneously resolves the dimensional dependence of many-body correlations in confined quantum systems and pioneers approaches for quantum-critical manipulation in molecular spin architectures. |
| title | Construction of Kondo Chains by Engineering Porphyrin π-Radicals on Au(111) |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2506.10729 |