Magnon-Mediated Superconductivity in the Infinite-$U$ Triangular Lattice
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918325099954176 |
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| author | Zhu, Hantian Zhang, Yixin Zhang, Shang-Shun Zhang, Yang Batista, Cristian D. |
| author_facet | Zhu, Hantian Zhang, Yixin Zhang, Shang-Shun Zhang, Yang Batista, Cristian D. |
| contents | We demonstrate that the infinite-$U$ triangular-lattice Hubbard model supports a superconducting state built from tightly bound Cooper pairs composed of two holes and one magnon ($2h1m$). Building on the seminal prediction of repulsively bound $2h1m$ states, we show that next-nearest-neighbor hopping $t_{2}$ coherently mixes symmetry-related configurations, stabilizing an $s$-wave bound state with substantial binding energy and a light effective mass. Large-scale DMRG calculations at finite doping identify a magnetization plateau corresponding to a gas of such bound states and quasi--long--range superconducting order with power-law $2h1m$ pair correlations. Our results establish a magnon-mediated superconducting mechanism driven by kinetic frustration, with immediate detectable signatures for moiré Hubbard materials and ultracold-atom simulators. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_06231 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnon-Mediated Superconductivity in the Infinite-$U$ Triangular Lattice Zhu, Hantian Zhang, Yixin Zhang, Shang-Shun Zhang, Yang Batista, Cristian D. Superconductivity We demonstrate that the infinite-$U$ triangular-lattice Hubbard model supports a superconducting state built from tightly bound Cooper pairs composed of two holes and one magnon ($2h1m$). Building on the seminal prediction of repulsively bound $2h1m$ states, we show that next-nearest-neighbor hopping $t_{2}$ coherently mixes symmetry-related configurations, stabilizing an $s$-wave bound state with substantial binding energy and a light effective mass. Large-scale DMRG calculations at finite doping identify a magnetization plateau corresponding to a gas of such bound states and quasi--long--range superconducting order with power-law $2h1m$ pair correlations. Our results establish a magnon-mediated superconducting mechanism driven by kinetic frustration, with immediate detectable signatures for moiré Hubbard materials and ultracold-atom simulators. |
| title | Magnon-Mediated Superconductivity in the Infinite-$U$ Triangular Lattice |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2602.06231 |