Quantum spin liquid from electron-phonon coupling
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866909815594287104 |
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| author | Cai, Xun Han, Zhaoyu Li, Zi-Xiang Kivelson, Steven A. Yao, Hong |
| author_facet | Cai, Xun Han, Zhaoyu Li, Zi-Xiang Kivelson, Steven A. Yao, Hong |
| contents | A quantum spin liquid (QSL) is an exotic insulating phase with emergent gauge fields and fractionalized excitations. However, the unambiguous demonstration of the existence of a QSL in a "non-engineered" microscopic model (or in any material) remains challenging. Here, using numerically-exact sign-problem-free quantum Monte Carlo simulations, we show that a QSL arises in a non-engineered electron-phonon model. Specifically, we investigate the ground-state phase diagram of the bond Su-Schrieffer-Heeger (SSH) model on a 2D triangular lattice at half filling (one electron per site) which we show includes a QSL phase which is fully gapped, exhibits no symmetry-breaking order, and supports deconfined fractionalized holon excitations. This suggests new routes for finding QSLs in realistic materials and high-$T_c$ superconductivity by lightly doping them. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_04002 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Quantum spin liquid from electron-phonon coupling Cai, Xun Han, Zhaoyu Li, Zi-Xiang Kivelson, Steven A. Yao, Hong Strongly Correlated Electrons Superconductivity A quantum spin liquid (QSL) is an exotic insulating phase with emergent gauge fields and fractionalized excitations. However, the unambiguous demonstration of the existence of a QSL in a "non-engineered" microscopic model (or in any material) remains challenging. Here, using numerically-exact sign-problem-free quantum Monte Carlo simulations, we show that a QSL arises in a non-engineered electron-phonon model. Specifically, we investigate the ground-state phase diagram of the bond Su-Schrieffer-Heeger (SSH) model on a 2D triangular lattice at half filling (one electron per site) which we show includes a QSL phase which is fully gapped, exhibits no symmetry-breaking order, and supports deconfined fractionalized holon excitations. This suggests new routes for finding QSLs in realistic materials and high-$T_c$ superconductivity by lightly doping them. |
| title | Quantum spin liquid from electron-phonon coupling |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2408.04002 |