Nagaoka supermetal in the particle-doped triangular Hubbard model

• URL: http://arxiv.org/abs/2605.13837v1
• Date: Wed, 13 May 2026 17:58:13 GMT
• Title: Nagaoka supermetal in the particle-doped triangular Hubbard model
• Abstract summary: We investigate the triangular-lattice Hubbard model with particle doping and provide compelling evidence for an intrinsic interaction-driven quantum state.<n>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.<n>Our findings offer a new perspective on non-Fermi liquid states in geometrically frustrated systems and are directly accessible in current ultracold atom experiments.
• Score: 5.549185040513596
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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