Van Hove Singularity-Driven Topological Magnetism in Twisted MoTe2
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| author | Park, Heonjoon Stewart, Julian Zhang, Xiao-Wei Wang, Taige Zhang, Canxun Redekop, Evgeny Cai, Jiaqi Li, Weijie Anderson, Eric Taniguchi, Takashi Watanabe, Kenji Chu, Jiun-Haw Cobden, David Young, Andrea Fu, Liang Cao, Ting Xiao, Di Xu, Xiaodong |
| author_facet | Park, Heonjoon Stewart, Julian Zhang, Xiao-Wei Wang, Taige Zhang, Canxun Redekop, Evgeny Cai, Jiaqi Li, Weijie Anderson, Eric Taniguchi, Takashi Watanabe, Kenji Chu, Jiun-Haw Cobden, David Young, Andrea Fu, Liang Cao, Ting Xiao, Di Xu, Xiaodong |
| contents | Van Hove singularities (vHSs) strongly amplify electron interactions and can stabilize correlated phases in topological bands. Here we report signatures of topological magnetism in large-angle twisted bilayer MoTe2 driven by the interplay of vHSs, strong correlations, and valley topology. In a 4.8 degree device, electrostatic tuning to a vHS produces a spontaneous anomalous Hall hot spot near nu = -1. Combined transport and reflective magnetic circular dichroism measurements indicate that this regime is not governed by magnetization alone, but instead emerges from a correlated intervalley-coherent antiferromagnetic state that evolves with doping into a canted phase. With increasing magnetic field, the Hall response develops an additional finite-field component consistent with a topological Hall effect from a noncoplanar spin texture, before transitioning into a C = -1 Chern insulator. Our results establish tunable vHSs in moire topological bands as a route to chiral magnetism and engineering topological phase transitions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_23587 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Van Hove Singularity-Driven Topological Magnetism in Twisted MoTe2 Park, Heonjoon Stewart, Julian Zhang, Xiao-Wei Wang, Taige Zhang, Canxun Redekop, Evgeny Cai, Jiaqi Li, Weijie Anderson, Eric Taniguchi, Takashi Watanabe, Kenji Chu, Jiun-Haw Cobden, David Young, Andrea Fu, Liang Cao, Ting Xiao, Di Xu, Xiaodong Mesoscale and Nanoscale Physics Strongly Correlated Electrons Van Hove singularities (vHSs) strongly amplify electron interactions and can stabilize correlated phases in topological bands. Here we report signatures of topological magnetism in large-angle twisted bilayer MoTe2 driven by the interplay of vHSs, strong correlations, and valley topology. In a 4.8 degree device, electrostatic tuning to a vHS produces a spontaneous anomalous Hall hot spot near nu = -1. Combined transport and reflective magnetic circular dichroism measurements indicate that this regime is not governed by magnetization alone, but instead emerges from a correlated intervalley-coherent antiferromagnetic state that evolves with doping into a canted phase. With increasing magnetic field, the Hall response develops an additional finite-field component consistent with a topological Hall effect from a noncoplanar spin texture, before transitioning into a C = -1 Chern insulator. Our results establish tunable vHSs in moire topological bands as a route to chiral magnetism and engineering topological phase transitions. |
| title | Van Hove Singularity-Driven Topological Magnetism in Twisted MoTe2 |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.23587 |