Optimizing superlattice bilayer graphene for a fractional Chern insulator
Fuente:
arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
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| _version_ | 1866909605788909568 |
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| author | Ault-McCoy, Dathan Lhachemi, M. Nabil Y. Dunbrack, Aaron Ghorashi, Sayed Ali Akbar Cano, Jennifer |
| author_facet | Ault-McCoy, Dathan Lhachemi, M. Nabil Y. Dunbrack, Aaron Ghorashi, Sayed Ali Akbar Cano, Jennifer |
| contents | Bernal-stacked bilayer graphene modulated by a superlattice potential is a highly tunable system predicted to realize isolated topological flat bands. In this work we calculate the band structure and quantum geometry of bilayer graphene subject to both triangular and square superlattices, across a wide range of gate voltages. We identify the parameter regime that optimizes the "single-particle indicators" for the stability of a fractional Chern insulator (FCI) when a topological flat band is partially filled. Our results guide the experimental realization of an FCI in this platform. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05551 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optimizing superlattice bilayer graphene for a fractional Chern insulator Ault-McCoy, Dathan Lhachemi, M. Nabil Y. Dunbrack, Aaron Ghorashi, Sayed Ali Akbar Cano, Jennifer Mesoscale and Nanoscale Physics Bernal-stacked bilayer graphene modulated by a superlattice potential is a highly tunable system predicted to realize isolated topological flat bands. In this work we calculate the band structure and quantum geometry of bilayer graphene subject to both triangular and square superlattices, across a wide range of gate voltages. We identify the parameter regime that optimizes the "single-particle indicators" for the stability of a fractional Chern insulator (FCI) when a topological flat band is partially filled. Our results guide the experimental realization of an FCI in this platform. |
| title | Optimizing superlattice bilayer graphene for a fractional Chern insulator |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.05551 |