Pseudogap in the lightly hole-doped triangular-lattice moiré Hubbard model
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915512394448896 |
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| author | Kuz'min, V. I. Visotin, M. A. Ovchinnikov, S. G. |
| author_facet | Kuz'min, V. I. Visotin, M. A. Ovchinnikov, S. G. |
| contents | The electronic structure of the lightly hole-doped triangular-lattice moiré Hubbard model is studied within cluster perturbation theory (CPT) using 13-site clusters for a fixed doping concentration $p=1/13$ varying the Coulomb parameter $U$ and the hopping phase parameter $ϕ$ related to the spin-orbital interaction. We have also developed a rather simple generalized mean-field approximation (GMFA) containing the amplitude of the spin correlations as a free parameter to fit the CPT data.The evolution of the Fermi surface and the pseudogap with the parameters $ϕ$ and $U$ is explained from the viewpoint of the short-range magnetic order. The geometric frustration and the additional model parameter related to the spin-orbital interaction result in a more rich physics of the pseudogap state compared to the case of a more conventional square lattice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_09586 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pseudogap in the lightly hole-doped triangular-lattice moiré Hubbard model Kuz'min, V. I. Visotin, M. A. Ovchinnikov, S. G. Strongly Correlated Electrons The electronic structure of the lightly hole-doped triangular-lattice moiré Hubbard model is studied within cluster perturbation theory (CPT) using 13-site clusters for a fixed doping concentration $p=1/13$ varying the Coulomb parameter $U$ and the hopping phase parameter $ϕ$ related to the spin-orbital interaction. We have also developed a rather simple generalized mean-field approximation (GMFA) containing the amplitude of the spin correlations as a free parameter to fit the CPT data.The evolution of the Fermi surface and the pseudogap with the parameters $ϕ$ and $U$ is explained from the viewpoint of the short-range magnetic order. The geometric frustration and the additional model parameter related to the spin-orbital interaction result in a more rich physics of the pseudogap state compared to the case of a more conventional square lattice. |
| title | Pseudogap in the lightly hole-doped triangular-lattice moiré Hubbard model |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.09586 |