Interplay of ferromagnetism, nematicity and Fermi surface nesting in kagome flat band
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912983366500352 |
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| author | He, Yuman Jiang, Wentao Wu, Siqi Ying, Xuzhe Jack, Berthold Dai, Xi Po, Hoi Chun |
| author_facet | He, Yuman Jiang, Wentao Wu, Siqi Ying, Xuzhe Jack, Berthold Dai, Xi Po, Hoi Chun |
| contents | Recent experiment on Fe-doped CoSn has uncovered a series of correlated phases upon hole doping of the kagome flat bands. Among the phases observed, a nematic phase with a six- to two-fold rotation symmetry breaking is found to prevail over a wide doping and temperature range. Motivated by these observations, we investigate the interaction-driven phases realized in a kagome model with partially filled, weakly dispersing flat bands. Density-density interactions up to second-nearest neighbors are considered. We identify a close competition between ferromagnetic and nematic phases in our self-consistent Hartree-Fock calculations: while on-site interaction favors ferromagnetism, the sizable inter-sublattice interactions stabilize nematicity over a wide doping window. Competition from translational-symmetry-breaking phases is also considered. Overall, our results show that nematicity is a generic outcome of partially filled kagome flat bands and establish a minimal framework for understanding correlated flat-band phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_14593 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interplay of ferromagnetism, nematicity and Fermi surface nesting in kagome flat band He, Yuman Jiang, Wentao Wu, Siqi Ying, Xuzhe Jack, Berthold Dai, Xi Po, Hoi Chun Strongly Correlated Electrons Quantum Physics Recent experiment on Fe-doped CoSn has uncovered a series of correlated phases upon hole doping of the kagome flat bands. Among the phases observed, a nematic phase with a six- to two-fold rotation symmetry breaking is found to prevail over a wide doping and temperature range. Motivated by these observations, we investigate the interaction-driven phases realized in a kagome model with partially filled, weakly dispersing flat bands. Density-density interactions up to second-nearest neighbors are considered. We identify a close competition between ferromagnetic and nematic phases in our self-consistent Hartree-Fock calculations: while on-site interaction favors ferromagnetism, the sizable inter-sublattice interactions stabilize nematicity over a wide doping window. Competition from translational-symmetry-breaking phases is also considered. Overall, our results show that nematicity is a generic outcome of partially filled kagome flat bands and establish a minimal framework for understanding correlated flat-band phases. |
| title | Interplay of ferromagnetism, nematicity and Fermi surface nesting in kagome flat band |
| topic | Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2510.14593 |