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| Format: | Preprint |
| Veröffentlicht: |
2025
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| Online-Zugang: | https://arxiv.org/abs/2507.17819 |
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| author | Choi, Jungho Daniel Morales-Durán, Nicolás Kwan, Yves H. Millis, Andrew J. Regnault, Nicolas Guerci, Daniele |
| author_facet | Choi, Jungho Daniel Morales-Durán, Nicolás Kwan, Yves H. Millis, Andrew J. Regnault, Nicolas Guerci, Daniele |
| contents | We propose helically twisted homotrilayer transition metal dichalcogenides as a platform for realizing correlated topological phases of matter with higher and tunable Chern numbers. We show that a clear separation of scales emerges for small twist angles, allowing us to derive a low-energy continuum model that captures the physics within moiré-scale domains. We identify regimes of twist angle and displacement field for which the highest-lying hole band is isolated from other bands and is topological with $K$-valley Chern number $C=-2$. We demonstrate that varying the displacement field can induce a transition from $C=-2$ to $C=-1$, as well as from a topologically trivial band to a $C=-1$ band. We derive an effective tight-binding description for a high-symmetry stacking domain which is valid for a wide range of twist angles, and we show that the $C=-2$ band can remain stable at filling fraction $ν=-1$ in the presence of interactions in Hartree-Fock calculations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_17819 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Higher Chern bands in helical homotrilayer transition metal dichalcogenides Choi, Jungho Daniel Morales-Durán, Nicolás Kwan, Yves H. Millis, Andrew J. Regnault, Nicolas Guerci, Daniele Mesoscale and Nanoscale Physics We propose helically twisted homotrilayer transition metal dichalcogenides as a platform for realizing correlated topological phases of matter with higher and tunable Chern numbers. We show that a clear separation of scales emerges for small twist angles, allowing us to derive a low-energy continuum model that captures the physics within moiré-scale domains. We identify regimes of twist angle and displacement field for which the highest-lying hole band is isolated from other bands and is topological with $K$-valley Chern number $C=-2$. We demonstrate that varying the displacement field can induce a transition from $C=-2$ to $C=-1$, as well as from a topologically trivial band to a $C=-1$ band. We derive an effective tight-binding description for a high-symmetry stacking domain which is valid for a wide range of twist angles, and we show that the $C=-2$ band can remain stable at filling fraction $ν=-1$ in the presence of interactions in Hartree-Fock calculations. |
| title | Higher Chern bands in helical homotrilayer transition metal dichalcogenides |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.17819 |