Nature of the 1/3 Magnetization Plateau in Spin-1/2 Kagome Antiferromagnets
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912595035815936 |
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| author | He, Li-Wei Wang, Xinzhe Yu, Shun-Li Li, Jian-Xin |
| author_facet | He, Li-Wei Wang, Xinzhe Yu, Shun-Li Li, Jian-Xin |
| contents | We investigate the origin of the 1/3 magnetization plateau in the $S=1/2$ kagome antiferromagnetic Heisenberg model using the variational Monte Carlo and exact diagonalization methods, to account for the recent experimental observations in YCu$_3$(OH)$_{6+x}$Br$_{3-x}$ and YCu$_3$(OD)$_{6+x}$Br$_{3-x}$. We identify three degenerate valence-bond-solid (VBS) states forming a $\sqrt{3} \times \sqrt{3}$ unit cell. These states exhibit David-star patterns in the spin moment distribution with only two fractional values $-1/3$ and $2/3$, and are related through translational transformations. While the spin correlations in these VBS states are found to be short-range, resembling a quantum spin liquid, we show that they have a vanishing topological entanglement entropy and thus are topologically trivial many-body states. Our theoretical results provide strong evidence that the 1/3 magnetization plateau observed in recent experiments arises from these $\sqrt{3} \times \sqrt{3}$ VBS states with fractional spin moments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_18480 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nature of the 1/3 Magnetization Plateau in Spin-1/2 Kagome Antiferromagnets He, Li-Wei Wang, Xinzhe Yu, Shun-Li Li, Jian-Xin Strongly Correlated Electrons We investigate the origin of the 1/3 magnetization plateau in the $S=1/2$ kagome antiferromagnetic Heisenberg model using the variational Monte Carlo and exact diagonalization methods, to account for the recent experimental observations in YCu$_3$(OH)$_{6+x}$Br$_{3-x}$ and YCu$_3$(OD)$_{6+x}$Br$_{3-x}$. We identify three degenerate valence-bond-solid (VBS) states forming a $\sqrt{3} \times \sqrt{3}$ unit cell. These states exhibit David-star patterns in the spin moment distribution with only two fractional values $-1/3$ and $2/3$, and are related through translational transformations. While the spin correlations in these VBS states are found to be short-range, resembling a quantum spin liquid, we show that they have a vanishing topological entanglement entropy and thus are topologically trivial many-body states. Our theoretical results provide strong evidence that the 1/3 magnetization plateau observed in recent experiments arises from these $\sqrt{3} \times \sqrt{3}$ VBS states with fractional spin moments. |
| title | Nature of the 1/3 Magnetization Plateau in Spin-1/2 Kagome Antiferromagnets |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.18480 |