Nagaoka supermetal in the particle-doped triangular Hubbard model
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914563714187264 |
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| author | Cao, Rui Zhang, Xiangyue Tan, Hui Xu, Jian-Shu He, Yuan-Yao Yuan, Jianmin Li, Yongqiang |
| author_facet | Cao, Rui Zhang, Xiangyue Tan, Hui Xu, Jian-Shu He, Yuan-Yao Yuan, Jianmin Li, Yongqiang |
| contents | While the interplay of correlations and geometric frustration in doped Mott insulators provides a fertile ground for exotic quantum phases, the nature of the metallic state emerging upon particle doping remains poorly understood. In this work, we investigate the triangular-lattice Hubbard model with particle doping and provide compelling evidence for an intrinsic, interaction-driven quantum state, which we term the Nagaoka supermetal. This state is characterized by a sublinear temperature dependence in the DC resistivity, along with singular behaviors in the charge compressibility and zero-frequency spectral weight. To understand the origin of these singular properties, we derive an effective low-energy model and demonstrate that a higher-order Van Hove singularity emerges from the reconstructed dispersion. This singularity gives rise to a power-law divergence in the density of states, capturing the anomalous properties observed in the supermetallic regime. Our findings offer a new perspective on non-Fermi liquid states in geometrically frustrated systems and are directly accessible in current ultracold atom experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_13837 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nagaoka supermetal in the particle-doped triangular Hubbard model Cao, Rui Zhang, Xiangyue Tan, Hui Xu, Jian-Shu He, Yuan-Yao Yuan, Jianmin Li, Yongqiang Quantum Gases Strongly Correlated Electrons Quantum Physics While the interplay of correlations and geometric frustration in doped Mott insulators provides a fertile ground for exotic quantum phases, the nature of the metallic state emerging upon particle doping remains poorly understood. In this work, we investigate the triangular-lattice Hubbard model with particle doping and provide compelling evidence for an intrinsic, interaction-driven quantum state, which we term the Nagaoka supermetal. This state is characterized by a sublinear temperature dependence in the DC resistivity, along with singular behaviors in the charge compressibility and zero-frequency spectral weight. To understand the origin of these singular properties, we derive an effective low-energy model and demonstrate that a higher-order Van Hove singularity emerges from the reconstructed dispersion. This singularity gives rise to a power-law divergence in the density of states, capturing the anomalous properties observed in the supermetallic regime. Our findings offer a new perspective on non-Fermi liquid states in geometrically frustrated systems and are directly accessible in current ultracold atom experiments. |
| title | Nagaoka supermetal in the particle-doped triangular Hubbard model |
| topic | Quantum Gases Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2605.13837 |